Updated on 2023/09/13

写真a

 
NISHIKAWA Yunori
 
Organization
Graduate School of Science Department of Physics Lecturer
School of Science Department of Physics
Title
Lecturer
Affiliation
Institute of Science
Affiliation campus
Sugimoto Campus

Position

  • Graduate School of Science Department of Physics 

    Lecturer  2022.04 - Now

  • School of Science Department of Physics 

    Lecturer  2022.04 - Now

Degree

  • Doctor (Science) ( Kyoto University )

  • Master of Science ( Kyoto University )

  • Degree of Engineering ( Kyoto University )

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems  / 強相関電子系

  • Natural Science / Semiconductors, optical properties of condensed matter and atomic physics  / X線分光

Research Interests

  • 近藤効果、量子相転移 量子臨界点

Professional Memberships

  • 日本物理学会

      Domestic

Job Career (off-campus)

  • インペリアルカレッジロンドン   数学科   客員研究員

    2009.04 - 2010.03

  • 日本原子力研究所 関西研究所    放射光科学研究センター   博士研究員

    2003.04 - 2004.09

Education

  • Kyoto University   Doctor's Course   Graduated/Completed

    2000.04 - 2003.03

  • Kyoto University   Master's Course   Graduated/Completed

    1998.04 - 2000.03

  • Kyoto University     Graduated/Completed

    1993.04 - 1997.03

Papers

  • Kondo effect in Lieb's minimal ferrimagnetic system on the T-shaped bipartite lattice Reviewed

    Masashi Tokuda, Yunori Nishikawa

    Physical Review B   105   195120   2022.05

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    DOI: https://doi.org/10.1103/PhysRevB.105.195120

  • Bell-state correlations of quasiparticle pairs in the nonlinear current of a local Fermi liquid Reviewed

    Sakano Rui, Oguri Akira, Nishikawa Yunori, Abe Eisuke

    PHYSICAL REVIEW B   99 ( 15 )   2019.04( ISSN:2469-9950

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    We study Bell-state correlations for quasiparticle pairs excited in nonlinear current through a double quantum dot in the Kondo regime. Exploiting the renormalized perturbation expansion in the residual interactions of the local Fermi liquid and Bell's inequality for cross correlation of spin currents through distinct conduction channels, we derive an asymptotically exact form of Bell's correlation for the double dot at low bias voltages. We find that pairs of quasiparticles and holes excited by the residual exchange interaction violate Bell's inequality for the spin currents.

    https://arxiv.org/abs/1810.13032

    DOI: 10.1103/PhysRevB.99.155106

  • Magnetic field induced quantum criticality and the Luttinger sum rule Reviewed International coauthorship

    Nishikawa Y., Curtin O. J., Hewson A. C., Crow D. J. G.

    PHYSICAL REVIEW B   98 ( 10 )   2018.09( ISSN:2469-9950

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    We show that when there is a sudden transition from a small to a large Fermi surface at a field-induced quantum critical point—similar to what may have been observed in some heavy-fermion compounds—an additional term has to be taken into account in the Luttinger-Friedel sum rule. We calculate this additional term for a local model which has a field-induced quantum critical point (QCP) and show that it changes abruptly at the transition, such that it satisfies a generalized Luttinger-Friedel sum rule on each side of the transition, and characterizes the two Fermi-liquid phases separated by the QCP as a discrete (topological) index.

    https://arxiv.org/abs/1712.08771

    DOI: 10.1103/PhysRevB.98.104419

  • Fermi Liquids and the Luttinger Integral Reviewed International coauthorship

    Curtin O. J., Nishikawa Y., Hewson A. C., Crow D. J. G.

    JOURNAL OF PHYSICS COMMUNICATIONS   2 ( 3 )   2018.03( ISSN:2399-6528

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    The Luttinger Theorem, which relates the electron density to the volume of the Fermi surface in an itinerant electron system, is taken to be one of the essential features of a Fermi liquid. The microscopic derivation of this result depends on the vanishing of a certain integral, the Luttinger integral I L, which is also the basis of the Friedel sum rule for impurity models, relating the impurity occupation number to the scattering phase shift of the conduction electrons. It is known that non-zero values of I L with I L = ±π/2, occur in impurity models classified as singular Fermi liquids. Here we show the same values, I L = ±π/2, occur in an impurity model in phases with regular low energy Fermi liquid behavior. Consequently the Luttinger integral can be taken to characterize these phases, and the quantum critical points separating them interpreted as topological.

    https://arxiv.org/abs/1703.01807

    DOI: 10.1088/2399-6528/aab00e

  • Current cross-correlation in the Anderson impurity model with exchange interaction Reviewed

    Sakano Rui, Oguri Akira, Nishikawa Yunori, Abe Eisuke

    PHYSICAL REVIEW B   97 ( 4 )   2018.01( ISSN:2469-9950

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    We study spin entanglement of the quasiparticles of the local Fermi liquid excited in nonlinear current through a quantum dot described by the Anderson impurity model with two degenerate orbitals coupled to each other via an exchange interaction. Applying the renormalized perturbation theory, we obtain the precise form of the cumulant generating function and cross-correlations for the currents with spin angled to arbitrary directions, up to third order in the applied bias voltage. It is found that the exchange interaction gives rise to spin-angle dependency in the cross-correlation between the currents through the two different orbitals and also brings an intrinsic cross-correlation of currents with three different angular momenta.

    DOI: 10.1103/PhysRevB.97.045127

  • Conditions for observing emergent SU(4) symmetry in a double quantum dot Reviewed International coauthorship

    Nishikawa Yunori, Curtin Oliver J., Hewson Alex C., Crow Daniel J. G., Bauer Johannes

    PHYSICAL REVIEW B   93 ( 23 )   2016.06( ISSN:2469-9950

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    We analyze conditions for the observation of a low-energy SU(4) fixed point in capacitively coupled quantum dots. One problem, due to dots with different couplings to their baths, has been considered by L. Tosi, P. Roura-Bas, and A. A. Aligia, J. Phys.: Condens. Matter 27, 335601 (2015). They showed how symmetry can be effectively restored via the adjustment of individual gates voltages, but they make the assumption of infinite on-dot and interdot interaction strengths. A related problem is the difference in the magnitudes between the on-dot and interdot strengths for capacitively coupled quantum dots. Here we examine both factors, based on a two-site Anderson model, using the numerical renormalization group to calculate the local spectral densities on the dots and the renormalized parameters that specify the low-energy fixed point. Our results support the conclusions of Tosi et al. that low-energy SU(4) symmetry can be restored, but asymptotically achieved only if the interdot interaction U12 is greater than or of the order of the bandwidth of the coupled conduction bath
    D, which might be difficult to achieve experimentally. By comparing the SU(4) Kondo results for a total dot occupation ntot=1 and 2, we conclude that the temperature dependence of the conductance is largely determined by the constraints of the Friedel sum rule rather than the SU(4) symmetry and suggest that an initial increase of the conductance with temperature is a distinguishing characteristic feature of an
    ntot=1 universal SU(4) fixed point.

    DOI: 10.1103/PhysRevB.93.235115

  • Analysis of low-energy response and possible emergent SU(4) Kondo state in a double quantum dot Reviewed International coauthorship

    Nishikawa Yunori, Hewson Alex C., Crow Daniel J. G., Bauer Johannes

    PHYSICAL REVIEW B   88 ( 24 )   2013.12( ISSN:1098-0121

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    We examine the low-energy behavior of a double quantum dot in a regime where spin and pseudospin excitations are degenerate. The individual quantum dots are described by Anderson impurity models with an on-site interaction U which are capacitively coupled by an interdot interaction U12<U. The low-energy response functions are expressed in terms of renormalized parameters, which can be deduced from an analysis of the fixed point in a numerical renormalization group calculation. At the point where the spin and pseudospin degrees of freedom become degenerate, the free quasiparticle excitations have a phase shift of π/4 and a 4-fold degeneracy. We find, however, when the quasiparticle interactions are included, that the low-energy effective model has SU(4) symmetry only in the special case U12=U unless both U and U12 are greater than D, the half bandwidth of the conduction electron bath. We show that the gate voltage dependence of the temperature-dependent differential conductance observed in recent experiments can be described by a quasiparticle density of states with temperature-dependent renormalized parameters.

    DOI: 10.1103/PhysRevB.88.245130

  • Hund's rule coupling in models of magnetic impurities and quantum dots Reviewed International coauthorship

    Nishikawa Y., Hewson A. C.

    PHYSICAL REVIEW B   86 ( 24 )   2012.12( ISSN:1098-0121

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    Studies of the effects of the Hund's rule coupling JH in multiple orbit impurities or quantum dots using different models have led to quite different predictions for the Kondo temperature TK as a function of JH. We show that the differences depend on whether or not the models conserve orbital angular momentum about the impurity site. Using numerical renormalization-group calculations, we deduce the renormalized parameters for the Fermi liquid regime and show that, despite the differences between the models, the low-energy fixed point in the strong-correlation regime is universal, with a single energy scale
    TK and just two renormalized interaction parameters, a renormalized single orbital term, ˜U=4TK, and a renormalized Hund's rule term, ˜JH=8TK/3.

    DOI: 10.1103/PhysRevB.86.245131

  • Phase diagram and critical points of a double quantum dot Reviewed International coauthorship

    Nishikawa Y., Crow D. J. G., Hewson A. C.

    PHYSICAL REVIEW B   86 ( 12 )   2012.09( ISSN:1098-0121

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    We apply a combination of numerical renormalization group (NRG) and renormalized perturbation theory (RPT) to a model of two quantum dots (impurities) described by two Anderson impurity models hybridized to their respective baths. The dots are coupled via a direct Coulomb interaction U12 and a spin exchange interaction
    J. The model has two types of quantum critical points, one at J=Jc to a local singlet state and one at U12=Uc12 to a locally charge ordered state. The renormalized parameters which determine the low energy behavior are calculated from the NRG. The results confirm the values predicted from the RPT on the approach to the critical points, which can be expressed in terms of a single energy scale T∗ in all cases. This includes cases without particle-hole symmetry, and cases with asymmetry between the dots, where there is also a transition at J=Jc. The results give a comprehensive quantitative picture of the behavior of the model in the low energy Fermi liquid regimes, and some of the conclusions regarding the emergence of a single energy scale may apply to a more general class of quantum critical points, such as those observed in some heavy fermion systems.

    DOI: 10.1103/PhysRevB.86.125134

  • Full Counting Statistics for Orbital-Degenerate Impurity Anderson Model with Hund's Rule Exchange Coupling Reviewed International coauthorship

    Sakano Rui, Nishikawa Yunori, Oguri Akira, Hewson Alex C., Tarucha Seigo

    PHYSICAL REVIEW LETTERS   108 ( 26 )   2012.06( ISSN:0031-9007

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    We study nonequilibrium current fluctuations through a quantum dot, which includes a ferromagnetic Hund’s rule coupling J, in the low-energy Fermi liquid regime using the renormalized perturbation theory. The resulting cumulant for the current distribution in the particle-hole symmetric case shows that spin-triplet and spin-singlet pairs of quasiparticles are formed in the current due to the Hund’s rule coupling, and these pairs enhance the current fluctuations. In the fully screened higher-spin Kondo limit, the Fano factor takes a value Fb=(9M+6)/(5M+4) determined by the orbital degeneracy M. We also investigate the crossover between the small and large J limits in the two-orbital case M=2, using the numerical renormalization group approach.

    DOI: 10.1103/PhysRevLett.108.266401

  • Convergence of Energy Scales on the Approach to a Local Quantum Critical Point Reviewed International coauthorship

    Nishikawa Y., Crow D. J. G., Hewson A. C.

    PHYSICAL REVIEW LETTERS   108 ( 5 )   2012.01( ISSN:0031-9007

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    We find the emergence of strong correlations and universality on the approach to the quantum critical points of a two-impurity Anderson model. The two impurities are coupled by an interimpurity exchange interaction J and direct interaction U12 and are hybridized with separate conduction channels. The low energy behavior is described in terms of renormalized parameters. We show that on the approach to the transitions to a local singlet and a local charged ordered state, the quasiparticle weight factor z→0
    , and the renormalized parameters can be expressed in terms of a single energy scale T∗. The values of the renormalized interaction parameters in terms of T∗
    can be predicted from the condition of continuity of the spin and charge susceptibilities, and correspond to strong correlation. These predictions are confirmed by the numerical renormalization group calculations, including the case when the on site interaction U=0.

    DOI: 10.1103/PhysRevLett.108.056402

  • Kondo effects in a triangular triple quantum dot with lower symmetries Reviewed International coauthorship

    Oguri A., Amaha S., Nishikawa Y., Numata T., Shimamoto M., Hewson A. C., Tarucha S.

    PHYSICAL REVIEW B   83 ( 20 )   2011.05( ISSN:1098-0121

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    We study the low-energy properties and characteristic Kondo energy scale of a triangular triple quantum dot, connected to two non-interacting leads, in a wide parameter range of a gate voltage and distortions which lower the symmetry of an equilateral structure, using the numerical renormalization group approach. For large Coulomb interactions, the ground states with different characters can be classified according to the plateaus of Θ≡(δe−δo)(2/π), where δe and δo are the phase shifts for the even and odd partial waves. At these plateaus of Θ, both Θ and the occupation number Ntot≡(δe+δo)(2/π) take values close to integers, and thus the ground states can be characterized by these two integers. The Kondo effect with a local moment with total spin S=1 due to a Nagaoka mechanism appears on the plateau, which can be identified by Θ≃2.0 and Ntot≃4.0. For large distortions, however, the high-spin moment disappears through a singlet-triplet transition occurring within the four-electron region. It happens at a crossover to the adjacent plateaus for Θ≃0.0 and Θ≃4.0, and the two-terminal conductance has a peak in the transient regions. For weak distortions, the SU(4) Kondo effect also takes place for Ntot≃3.0. It appears as a sharp conductance valley between the S=1/2 Kondo ridges on both sides. We also find that the characteristic energy scale T∗ reflect these varieties of the Kondo effect. Particularly, T ∗ is sensitive to the distribution of the charge and spin in the triangular triple dot.

    DOI: 10.1103/PhysRevB.83.205304

  • Renormalized parameters and perturbation theory for an n-channel Anderson model with Hund's rule coupling: Asymmetric case Reviewed International coauthorship

    Nishikawa Y., Crow D. J. G., Hewson A. C.

    PHYSICAL REVIEW B   82 ( 24 )   2010.12( ISSN:1098-0121

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    We explore the predictions of the renormalized perturbation theory for the n-channel Anderson model, both with and without Hund’s rule coupling, in the regime away from particle-hole symmetry. For the model with n=2 we deduce the renormalized parameters from numerical renormalization-group calculations and plot them as a function of the local occupation of the impurity site nd. From the exact relations in terms of the renormalized parameters, we calculate the orbital, spin and charge susceptibilities, Wilson ratios, and quasiparticle density of states at T=0, in the different parameter regimes, which gives a comprehensive overview of the low-energy behavior of the model. We compare the difference in Kondo behaviors at the points, where nd=1 and nd=2. Some unexpected features of the results are that a strong on-site interaction gives significant renormalization and suppression charge susceptibility in the intermediate valence regimes, and the peaks in the spin susceptibility away from the particle-hole symmetric case do not occur at integer values nd=1,3

    DOI: 10.1103/PhysRevB.82.245109

  • Renormalized parameters and perturbation theory for an n-channel Anderson model with Hund's rule coupling: Symmetric case Reviewed International coauthorship

    Nishikawa Y., Crow D. J. G., Hewson A. C.

    PHYSICAL REVIEW B   82 ( 11 )   2010.09( ISSN:1098-0121

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    We extend the renormalized perturbation theory for the single-impurity Anderson model to the n-channel model with a Hund’s rule coupling, and show that the exact results for the spin, orbital, and chargesusceptibilities, as well as the leading low-temperature dependence for the resistivity, are obtained by working to second order in the renormalized couplings. A universal relation is obtained between the renormalized parameters, independent of n, in the Kondo regime. An expression for the dynamic spin susceptibility is also derived by taking into account repeated quasiparticle scattering, which is asymptotically exact in the low-frequency regime and satisfies the Korringa-Shiba relation. The renormalized parameters, including the renormalized Hund’s rule coupling, are deduced from numerical renormalization-group calculations for the model for the case n=2. The results confirm explicitly the universal relations between the parameters in the Kondo regime. Using these results, we evaluate the spin, orbital, and charge susceptibilities, temperature dependence of the low-temperature resistivity, and dynamic spin susceptibility for the particle-hole symmetric regime of the n=2 model.

    DOI: 10.1103/PhysRevB.82.115123

  • Electronic Structure and Momentum-Dependent Resonant Inelastic X-Ray Scattering in Broad Band Materials Reviewed

    Yunori Nisikawa

    Materials Science Forum   645-648   235 - 238   2010.04

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    We theoretically investigate a momentum-dependent resonant inelastic X-ray scattering (RIXS) in broad band materials. Taking 3C-SiC, Si and Ge as typical examples of broad band materials, we calculate BINS spectra by changing transferred momenta.. The RIXS spectra at the Si K edge of 3C-SiC have strong transferred momentum dependence. On the other hand, the RIXS spectra at the K edge of Ge have almost no transferred momentum dependence. In the case of RIXS at the K edge of Si, the spectra have weak transferred momentum dependence. Through an explanation of the transferred momentum dependence for 3C-SiC, Si and Ge, we point out that a RIXS can be utilized to study valence band dispersion for broad band materials. We illustrate how to extract the valence bands dispersion from the transferred momentum dependence of the spectra, taking the RIXS at the Si K edge of 3C-SiC as a typical example.

    DOI: 10.4028/www.scientific.net/MSF.645-648.235

  • Momentum-dependent resonant inelastic X-ray scattering at the Si K edge of 3C-SiC: A theoretical study on a relation between spectra and valence band dispersion Reviewed

    Nisikawa Y., Ibuki M., Usuda M.

    PHYSICA B-CONDENSED MATTER   405 ( 5 )   1415 - 1422   2010.03( ISSN:0921-4526

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    We theoretically demonstrate that a resonant inelastic X-ray scattering (RIXS) with a sizable momentum transfer can be utilized to study valence band dispersion for broad band materials. We take RIXS at the Si K edge of 3C-SiC as a typical example. The RIXS spectra are calculated by systematically changing the transferred momentum, an incident photon polarization and an incident photonenergy, on the basis of an ab initio calculation. We find that the spectra depend heavily on both the transferred momentum and the incident photon polarization, and the peaks in the spectra correspond to the energies of the valence bands. We conclude that the information on the energy dispersion of valence bands can be extracted from the transferred momentum dependence of the RIXS spectra. These findings lead to further application for RIXS when investigating the band structure of broad band materials.

    DOI: 10.1016/j.physb.2009.12.011

  • Kondo effects in a triangular triple quantum dot: Numerical renormalization group study in the whole region of the electron filling Reviewed International coauthorship

    Numata Takahide, Nisikawa Yunori, Oguri Akira, Hewson Alex C.

    PHYSICAL REVIEW B   80 ( 15 )   2009.10( ISSN:1098-0121

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    We study the low-energy properties of a triangular triple quantum dot connected to two noninteracting leads in a wide parameter range, using the numerical renormalization group (NRG). Various kinds of Kondo effects take place in this system depending on the electron filling Ntot, or the level position ϵd of the triple dot. The SU(4) Kondo behavior is seen in the half-filled case Ntot≃3.0 at the dip of the series conductance, and it causes a charge redistribution between the even and odd orbitals in the triangle. We show generally that the quasiparticle excitations from a local Fermi-liquid ground state acquire a channel symmetry at zero points of the two-terminal conductance, in the case the system has time-reversal and inversion symmetries. It causes the SU(4) behavior at low energies, while the orbital degeneracy in the triangle determines the high-energy behavior. At four-electron filling Ntot≃4.0, a local S=1 moment emerges at high temperatures due to a Nagaoka ferromagnetic mechanism. It is fully screened by the electrons from the two conducting channels via a two-stage Kondo effect, which is caused by a difference in the charge distribution in the even and odd orbitals.

    DOI: 10.1103/PhysRevB.80.155330

  • Transport through a double quantum dot with interdot repulsion Reviewed

    Yunori Nisikawa, Akira Oguri

    Journal of Physics Conference Series   2009

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    DOI: 10.1088/1742-6596/150/2/022066

  • Theoretical study on superconductivity in CeMIn5 (M = Co, Rh, Ir): pairing symmetry and pressure dependence Reviewed

    Tanaka Kazunori, Ikeda Hiroaki, Nisikawa Yunori, Yamada Kosaku

    JOURNAL OF PHYSICS-CONDENSED MATTER   19 ( 40 )   2007.10( ISSN:0953-8984

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    We study theoretically heavy fermion superconductors CeMIn5 (M = Co, Rh, Ir). CeCoIn5 and CeIrIn5 that become superconducting at ambient pressure with Tc = 2.3 K and 0.4 K, respectively. On the other hand, CeRhIn5 is an antiferromagnet at ambient pressure and becomes superconducting under pressures greater than 1.6 GPa. With regards to the superconductivity, the existence of line nodes is indicated by nuclear-quadrupole-resonance (NQR), thermal conductivity, specific heat and electrical resistivity measurements. However, the pairing symmetry between dx2−y2 and dxy is controversial. Therefore, we investigate the gap structure of CeMIn5 by a detailed calculation. We introduce a three-dimensional periodic Anderson model (3D-PAM) in order to reproduce the band characteristics of CeMIn5. Thus, we identify the gap structure of CeMIn5 as the dx2−y2 symmetry by solving the Èliashberg equations. In addition, we discuss the pressure dependence of Tc and show that two factors determine Tc. One factor is the momentum dependence of quasi-particle interaction and the other factor is the wavefunction renormalization factor. Thus, we have explained the superconductivity in CeMIn5 using the Fermi liquid theory.

    DOI: 10.1088/0953-8984/19/40/406219

  • Kondo screening of a high-spin Nagaoka state in a triangular quantum dot Reviewed

    Oguri Akira, Nisikawa Yunori, Tanaka Yoshihide, Numata Takahide

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   1139 - 1141   2007.03( ISSN:0304-8853

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    We study transport through a triangle triple quantum dot connected to two noninteracting leads using the numerical renormalization group (NRG). The triangle has a high-spin ground state of caused by a Nagaoka ferromagnetism, when it is isolated and has one extra electron introduced into a half-filling. The results show that the conduction electrons screen the local moment via two separate stages with different energy scales. The half of the is screened first by one of the channel degrees, and then at very low temperature the remaining half is fully screened to form a Kondo singlet. The transport is determined by two phase shifts for quasi-particles with even and odd parities, and then a two-terminal conductance in the series configuration is suppressed , while plateau of a four-terminal parallel conductance reaches a unitary limit value of two conducting modes.

    DOI: 10.1016/j.jmmm.2006.10.890

  • Electronic structure of CuGeO3 in the spin-Peierls phase: Calculation within the LDA and LDA plus U scheme Reviewed

    Nisikawa Yunori, Usuda Manabu, Oguri Akira

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   1632 - 1634   2007.03( ISSN:0304-8853

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    The electronic structure of in the spin-Peierls (SP) phase with the space group of Bbcm is calculated for the first time within the local-density approximation (LDA) and the scheme where the local 3d–3d Coulomb interaction U is introduced on the Cu sites. Although the insulating antiferromagnetic solution is obtained in the LDA, the obtained bandgap of and a magnetic moment of are much smaller than the experimental bandgap of and the magnetic moment of , respectively. With the value of determined using an electron spectroscopy, the calculation yields a charge-transfer bandgap of and gives a magnetic moment of . The essential electronic and magnetic properties of in the SP phase can be described by means of the scheme.

    DOI: 10.1016/j.jmmm.2006.10.489

  • Numerical renormalization group approach to a quartet quantum-dot array connected to reservoirs: Gate-voltage dependence of the conductance Reviewed

    Nisikawa Y, Oguri A

    PHYSICAL REVIEW B   73 ( 12 )   2006.03( ISSN:1098-0121

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    The ground-state properties of quartet quantum-dot arrays are studied using the numerical renormalization group (NRG) method with a four-site Hubbard model connected to two noninteracting leads. Specifically, we calculate the conductance and local charge in the dots from the many-body phase shifts, which can be deduced from the fixed-point eigenvalues of NRG. As a function of the on-site energy ϵd which corresponds to the gate voltage, the conductance shows alternatively wide peaks and valleys. Simultaneously, the total number of electrons Nel in the four dots shows a quantized staircase behavior due to a large Coulomb interaction
    U. The conductance plateaus of the unitary limit emerging for odd Nel are caused by the Kondo effect. The valleys of the conductance emerge for even Nel
    , and their width becomes substantially large at half-filling. It can be regarded as a kind of the Mott-Hubbard insulating behavior manifesting in a small system. These structures of the plateaus and valleys become weak for large values of the hybridization strength Γ between the chain and leads. We also discuss the parallel conductance for the array connected to four leads.

    DOI: 10.1103/PhysRevB.73.125108

  • Theory of superconductivity in CeMIn5 (M = Co, Rh, Ir) on the basis of the three dimensional periodic Anderson model Reviewed

    Tanaka K, Ikeda H, Nisikawa Y, Yamada K

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 2 )   2006.02( ISSN:0031-9015

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    CeMIn 5 (M=Co, Rh, Ir) are heavy fermion compounds with a HoCoGa 5 -type structure. CeCoIn 5 and CeIrIn 5 become superconducting at ambient pressure with T c =2.3 and 0.4 K, respectively. On the other hand, CeRhIn 5 is an antiferromagnet at ambient pressure, and becomes superconducting under pressures greater than 1.6 GPa. Nuclear-quadrupole-resonance (NQR), thermal conductivity, specific heat, and electrical resistivity measurements indicate that the superconductivity in CeMIn 5 has line nodes. However, the pairing symmetry between d x 2 - y 2 and d x y is controversial based on the angle-dependent measurements of thermal conductivity and specific heat under the magnetic field, respectively. Therefore, we investigate the gap structure of CeMIn 5 by a detailed calculation. In order to reproduce the band structure characteristics of CeMIn 5 , we introduce a three-dimensional (3D) periodic Anderson model (PAM) and solve the Eliashberg equations. Thus, we identify the gap structure of CeMIn 5 as the d x 2 - y 2 symmetry. In addition, we discuss the pressure dependence of T c and show that two opposing factors determine T c . One factor is the momentum dependence of quasi-particle interaction and the other factor is the wave-function renormalization factor.

    DOI: 10.1143/JPSJ.75.024713

  • Banding of angular velocity in the current-driven vortex lattice of a type-II superconductor Reviewed

    Furukawa A, Nisikawa Y

    PHYSICAL REVIEW B   73 ( 6 )   2006.02( ISSN:1098-0121

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    We phenomenologically investigate a possible mechanism of the banding of angular velocity in a current-driven vortex lattice in type-II superconductors. It is shown that the plastic motion occurs above some critical value of the applied current, resulting in a splitting in the vortex lattice. The present model can qualitatively reproduce major features of the experimental results reported by Lopez et al. [Phys. Rev. Lett. 82, 1277 (1999)].

    DOI: 10.1103/PhysRevB.73.064511

  • Theory of Superconductivity in CeCoIn5 on the Basis of a Three-Dimensional Periodic Anderson Model Reviewed

    Tanaka Kazunori, Ikeda Hiroaki, Nisikawa Yunori, Yamada Kosaku

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75   250 - 252   2006.01( ISSN:0031-9015

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

    The pairing symmetry for CeCoIn 5 is controversial between d x 2 - y 2 and d x y from the angle-dependent measurements of thermal conductivity and specific heat under the magnetic field, respectively. Therefore we investigate the gap structure of CeCoIn 5 , and identify it as d x 2 - y 2 symmetry. In addition, we show that two opponent factors determine the pressure dependence of T c : the momentum dependence of quasi-particle interaction, and the wave-function renormalization factor.

    DOI: 10.1143/JPSJS.75S.250

  • Determination of the phase shifts for interacting electrons connected to reservoirs Reviewed International coauthorship

    Oguri A, Nisikawa Y, Hewson AC

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 9 )   2554 - 2562   2005.09( ISSN:0031-9015

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

    We describe a formulation to deduce the phase shifts, which determine the ground-state properties of interacting quantum-dot systems with the inversion symmetry, from the fixed-point eigenvalues of the numerical renormalization group (NRG). Our approach does not assume the specific form of the Hamiltonian nor the electron–hole symmetry, and it is applicable to a wide class of quantum impurities connected to noninteracting leads. We apply the method to a triple dot which is described by a three-site Hubbard chain connected to two noninteracting leads, and calculate the dc conductance away from half-filling. The conductance shows the typical Kondo plateaus of the Unitary limit g ≃2 e 2 / h in some regions of the onsite energy ε d , at which the total number of electrons N el in the three dots is odd, i.e., N el ≃1, 3 and 5. In contrast, the conductance shows a wide minimum in the regions of ε d corresponding to even number of electrons N el ≃2 and 4. We also discuss the parallel conductance of the triple dot connected transversely to four leads, and show that it can be deduced from the two phase shifts defined in the two-lead case.

    DOI: 10.1143/JPSJ.74.2554

  • Anisotropy of Resonant Inelastic X-ray Scattering at the K Edge of Si: Theoretical Analysis Reviewed

    Yunori Nisikawa, Manabu Usuda, and Jun-ichi Igarashi

    J. Phys. Soc. Jpn.   73   3171 - 3176   2004.11

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

    We investigate theoretically the resonant inelastic X-ray scattering (RIXS) at the K edge of Si on the basis of an ab initio calculation. We calculate the RIXS spectra with systematically varying transfered-momenta, incident-photon energy and incident-photon polarization. We confirm the anisotropy of the experimental spectra by Y. Ma et al. [Phys. Rev. Lett. 74 (1995) 478], providing a quantitative explanation of the spectra.

    DOI: 10.1143/JPSJ.73.3171

  • Possible pairing symmetry of superconductor NaxCoO2 center dot yH(2)O Reviewed

    Nisikawa Y, Ikeda H, Yamada K

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 5 )   1127 - 1130   2004.05( ISSN:0031-9015

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

    To discuss the possibility that the superconductivities in Na x CoO 2 · y H 2 O are induced by electron correlation, we investigate the possible pairing symmetry based on the single-band Hubbard model whose dispersion of the bare energy band is obtained using the band structure calculation of Na x CoO 2 · y H 2 O. The superconducting transition temperature is estimated by solving the Éliashberg equation. In this equation, both normal and anomalous self-energies are calculated up to the third-order terms with respect to the Coulomb repulsion. In the case of spin-singlet pairing, the candidate of pairing symmetry (the maximum eigen value λ max SS of Éliashberg's equation) belongs to the d -wave (E 2 representation of D 6 group). In the case of spin-triplet pairing, the candidate of pairing symmetry (the maximum eigen value λ max ST of Éliashberg's equation) belongs to the f y ( y 2 -3 x 2 ) -wave (B 1 representation of D 6 group). It is found that λ max SS ≃λ max ST and the transition temperatures of unconventional pairing state are estimated to be low compared with the observed temperature within our simple model.

    DOI: 10.1143/JPSJ.73.1127

  • Possibility of f-wave spin-triplet superconductivity in the CoO2 superconductor: A case study on a 2D triangular lattice in the repulsive Hubbard model Reviewed

    Ikeda H, Nisikawa Y, Yamada K

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 1 )   17 - 20   2004.01( ISSN:0031-9015

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

    Stimulated by the recent finding of the superconductivity in Na 0.35 CoO 2 .1.3H 2 O, we investigate superconducting instabilities on a 2D triangular lattice in the repulsive Hubbard model. Using the third-order perturbation expansion with respect to the on-site repulsion U , we evaluate the linearized Dyson–Gor'kov equation. We find that f -wave spin-triplet pairing is the most stable in a wide range of the next-nearest-neighbor hopping integral t ' and electron number density n . The introduction of t ' is crucial for adjusting the van Hove singularities to the neighborhood of the Fermi surface crossing around the K point. In this case, the bare spin susceptibility shows a broad peak around the Γ point. These conditions stabilize f -wave pairing. Although f -wave pairing is also given by the fluctuation-exchange approximation, the transition temperature is too low to be observed. This is because the depairing effect by the spin fluctuation is overestimated. Thus, the third-order vertex corrections are important for the spin-triplet superconductivity, similar to the case of Sr 2 RuO 4 .

    DOI: 10.1143/JPSJ.73.17

  • Resonant Inelastic X-Ray Scattering at the K Edge of Ge Reviewed

    Yunori Nisikawa, Manabu Usuda, Jun-ichi Igarashi, Hironobu Shoji, and Toshiaki Iwazumi

    J. Phys. Soc. Jpn.   73   970 - 975   2003.11

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

    We study the resonant inelastic x-ray scattering (RIXS) at the K edge of Ge. We measure RIXS spectra with systematically varying momenta in the final state. The spectra are a measure of exciting an electron–hole pair. We find a single-peak structure (except the elastic peak) as a function of photon energy, which is nearly independent of final-state momenta. We analyze the experimental data by means of the band structure calculation. The calculation reproduces well the experimental shape, clarifying the implication of the spectral shape.

    DOI: 10.1143/JPSJ.73.970

  • 重い電子系の超伝導の理論 Invited Reviewed

    池田浩章, 西川裕規, 兼安洋乃, 山田耕作

    固体物理   38 ( 9 )   619 - 627   2003.09

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:Domestic journal  

  • Study of the anomalously enhanced jump of the specific heat at the superconducting transition point in CeCoIn5 Reviewed

    Ikeda H, Nisikawa Y, Yamada K

    JOURNAL OF PHYSICS-CONDENSED MATTER   15 ( 28 )   S2241 - S2245   2003.07( ISSN:0953-8984

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

    We investigate an anomalously enhanced jump of the electronic specific heat at the superconducting transition point observed in CeCoIn5 within the fluctuation-exchange approximation. The strong antiferromagnetic spin fluctuation leads to strong-coupling superconductivity with a relatively high transition temperature. Simultaneously, the jump of the specific heat becomes large. This tendency also becomes stronger as the antiferromagnetic spin fluctuation becomes stronger.

    DOI: 10.1088/0953-8984/15/28/360

  • Spin-triplet and spin-singlet superconductivity in the Hubbard model on a triangular lattice Reviewed

    Nisikawa Y, Yamada K

    JOURNAL OF PHYSICS-CONDENSED MATTER   15 ( 28 )   S2227 - S2230   2003.07( ISSN:0953-8984

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    Within third-order perturbation theory, we discuss the possibility of spin-triplet and spin-singlet superconductivities in a two-dimensional Hubbard model on a triangular lattice for some model parameters corresponding to the heavy-fermion superconductors UM2Al3 (M = Pd,Ni) and organic superconductors under uniaxial strain. In the model of the heavy-fermion superconductors UM2Al3 (M = Pd,Ni), when we vary the symmetry in the dispersion of the bare energy band from D2 to D6, spin-singlet superconductivity in the D2-symmetric system is suppressed and we obtain spin-triplet superconductivity in the nearly D6-symmetric system. We point out the possibility that the results obtained correspond to the difference between the superconductivity of UPd2Al3 and that of UNi2Al3. In the model of organic superconductors under uniaxial strain, when we increase the diagonal hopping integral to above 1.2, we obtain the tendency for spin-triplet superconductivity to emerge. In all cases mentioned above, it is found that the vertex correction terms, which are not included in the interaction mediated by the spin fluctuation, are essential for realizing the spin-triplet pairing.

    DOI: 10.1088/0953-8984/15/28/357

  • Spin-triplet superconductivity in two-dimensional Hubbard model on triangular lattice Reviewed

    Nisikawa Y, Yamada K

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   388   57 - 58   2003.05( ISSN:0921-4534

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    We discuss the possibility of spin-triplet (ST) superconductivity in two-dimensional Hubbard model on triangular lattice within the third order perturbation theory. We obtain ST superconducting state. It is found that the vertex correction terms which are not included in the interaction mediated by the spin-fluctuation is essential for realizing the ST pairing for our searched values of parameters. We argue that the present mechanism of ST superconductivity can be applied to heavy-fermion superconductors UNi2Al3, UPt3.

    DOI: 10.1016/S0921-4534(02)02623-0

  • A mechanism of spin-triplet superconductivity in Hubbard model on triangular lattice: Application to UNi2Al3 Reviewed

    Nisikawa Y, Yamada K

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71 ( 11 )   2629 - 2632   2002.11( ISSN:0031-9015

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

    We discuss the possibility of spin-triplet superconductivity in a two-dimensional Hubbard model on a triangular lattice within the third-order perturbation theory. When we vary the symmetry in the dispersion of the bare energy band from D 2 to D 6 , spin-singlet superconductivity in the D 2 -symmetric system is suppressed and we obtain spin-triplet superconductivity in near the D 6 -symmetric system. In this case, it is found that the vertex terms, which are not included in the interaction mediated by the spin fluctuation, are essential for realizing the spin-triplet pairing. We point out the possibility that obtained results correspond to the difference between the superconductivity of UNi 2 Al 3 and that of UPd 2 Al 3 .

    DOI: 10.1143/JPSJ.71.2629

  • Perturbation theory on the superconductivity of heavy fermion superconductors CeIrxCo1-xIn5 Reviewed

    Nisikawa Y, Ikeda H, Yamada K

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71 ( 4 )   1140 - 1147   2002.04( ISSN:0031-9015

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

    We reformulate the Éliashberg's equation for the superconducting transition within the quasi-particle description, which takes account of the heavy electron mass. We discuss the superconductivity of CeIr x Co 1- x In 5 by using such a renormalized formula. On the basis of an effective two-dimensional Hubbard model which represents the most heavy quasi-two dimensional Fermi surface with f -character of CeIr x Co 1- x In 5 , both normal and anomalous self-energies are calculated up to third order with respect to the renormalized on-site repulsion U between quasi-particles. The superconducting transition temperature is obtained by solving the Éliashberg's equation. Reasonable transition temperatures are obtained for moderately large U . It is found that the momentum and frequency dependence of spin fluctuations given by RPA-like terms gives rise to the d-wave pairing state, while the vertex correction terms are important for obtaining reasonable transition temperatures and for differentiating n -dependence of T c . These obtained results seem to explain the x -dependence of T c in CeIr x Co 1- x In 5 and confirm the usefulness of the perturbation theory with respect to U .

    DOI: 10.1143/JPSJ.71.1140

  • Perturbation theory on the superconductivity of heavy fermion superconductor UPd2Al3 Reviewed

    Nisikawa Y, Yamada K

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71 ( 1 )   237 - 244   2002.01( ISSN:0031-9015

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

    We investigate the superconducting mechanism and the transition temperature of heavy fermion superconductor UPd 2 Al 3 on the basis of a single band two-dimensional Hubbard model on triangular lattice, which represents the most heavy band of UPd 2 Al 3 . Both normal and anomalous self-energies are calculated up to third order with respect to the Coulomb repulsion U between itinerant electrons. The superconducting transition temperature is obtained by solving the Éliashberg's equation. Reasonable transition temperatures are obtained for moderately large U . It is found that the momentum and frequency dependence of spin fluctuations given by RPA-like terms gives rise to the d-wave pairing state, while the vertex correction terms are important for obtaining reasonable transition temperatures. These results seem to show that the superconductivity in UPd 2 Al 3 can be explained by the perturbation theory with respect to U .

    DOI: 10.1143/JPSJ.71.237

  • あああ Reviewed

    63 ( 6-8 )   1479 - 1483   2002( ISSN:0022-3697

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Kind of work:Joint Work   International / domestic magazine:International journal  

    DOI: 10.1016/S0022-3697(02)00064-1

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Books and Other Publications

MISC

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Presentations

  • A New Topological Fermi Liquid State in Quantum Impurity Systems with Duality between localized and itinerant nature International conference

    Yunori Nishikawa

    The 10th International Workshop on the Dual Nature of f-Electrons  2023.06 

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    Venue:Himeji Hyogo Japan  

    https://sites.google.com/view/dual2023/home


    Other Link: https://omunet-my.sharepoint.com/:b:/g/personal/m21113v_omu_ac_jp/EYjT3Ox7LuZAvdv7OSv8oKcBFZLDMBsEPoLloCCZUshAaQ?e=ROiJfI

  • 最小フェリ磁性模型における近藤効果 Domestic conference

    徳田将志, 西川裕規

    The 26th symposium on the Physics and Applications of Spin-related Phenomena in Semiconductors  2021.12 

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    Presentation type:Oral presentation (general)  

  • 4重量子ドット系でのLiebフェリ磁性によるコンダクタンス抑制効果の堅牢性 Domestic conference

    徳田将志, 西川裕規

    日本物理学会2021年秋季大会  2021.09 

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    Presentation type:Oral presentation (general)  

  • bipartite-4重量子ドット系のコンダクタンスの相互作用依存性 Domestic conference

    Interaction dependence of conductance through a bipartite quartet quantumdot array

    日本物理学会第76回年次大会(2021年)  2021.03 

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    Presentation type:Oral presentation (general)  

  • 4重量子ドットにおけるLiebフェリ磁性に対する近藤効果とコンダクタンス Domestic conference

    Kondo effect on Lieb ferrimagnetism in quartet quantum dots and conductance through the dots

    日本物理学会2020年秋季大会  2020.09 

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    Presentation type:Oral presentation (general)  

  • Quantum criticality in quantum impurity systems and Luttinger-Friedel sum rule ~Luttinger integral as a topological invariant~ Invited International conference

    Y.Nishikawa

    International Symposium in Honor of Professor Nambu for the 10th Anniversary of his Nobel Prize in Physics  2018.12 

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    Presentation type:Oral presentation (invited, special)  

    Venue:Osaka City University  

  • 三角格子上のスピン三重項超伝導 Invited Domestic conference

    西川裕規

    2003年秋期大会 領域8シンポジウム 新規二次元三角格子化合物Na x CoO 2 ・yH 2 Oの超伝導  2003.03 

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    Presentation type:Oral presentation (general)  

    Venue: 岡山大学  

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Grant-in-Aid for Scientific Research

  • Research on universality and crossover near quantum critical points in strongly correlated quantum impurity systems

    Grant-in-Aid for Scientific Research(C)  2015.04

  • Theoretical study of the Kondo effects in quantum dots and nanomaterials

    Grant-in-Aid for Scientific Research(C)  2008

  • 内殻励起状態の第一原理計算法の開発とX線分光スペクトルへの適用

    Grant-in-Aid for Scientific Research on Priority Areas  2007

  • Theoretical study for the Kondo effect in the quantum transport

    Grant-in-Aid for Scientific Research(C)  2006

  • Theoretical study of elastic and inelastic resonant x-ray scattering

    Grant-in-Aid for Scientific Research(C)  2004

Outline of education staff

  • 量子力学2、量子力学2演習、 電磁気学とその演習2

Charge of on-campus class subject

  • 量子力学2演習

    2022   Weekly class   Undergraduate

  • 量子力学2

    2022   Weekly class   Undergraduate

  • 電磁気学とその演習2

    2022   Weekly class   Undergraduate

  • 物性物理学演習(M1)

    2021     Graduate school

  • 電磁気学とその演習2

    2021     Undergraduate

  • 量子力学2

    2021     Undergraduate

  • 量子力学2演習

    2021     Undergraduate

  • 特別実験・特別理論演習

    2021     Undergraduate

  • 物理学講読

    2021     Undergraduate

  • 前期特別研究

    2021     Graduate school

  • 後期特別研究

    2021     Graduate school

  • 後期特別研究

    2020     Graduate school

  • 前期特別研究

    2020     Graduate school

  • 物理学講読

    2020     Undergraduate

  • 特別実験・特別理論演習

    2020     Undergraduate

  • 量子力学2演習

    2020     Undergraduate

  • 量子力学2

    2020     Undergraduate

  • 電磁気学とその演習2

    2020     Undergraduate

  • 後期特別研究

    2019     Graduate school

  • 前期特別研究

    2019     Graduate school

  • 物理学講読

    2019     Undergraduate

  • 特別実験・特別理論演習

    2019     Undergraduate

  • 量子力学2演習

    2019     Undergraduate

  • 量子力学2

    2019     Undergraduate

  • 電磁気学とその演習2

    2019     Undergraduate

  • 後期特別研究

    2018     Graduate school

  • 前期特別研究

    2018     Graduate school

  • 物理学講読

    2018     Undergraduate

  • 特別実験・特別理論演習

    2018     Undergraduate

  • 電磁気学とその演習2

    2018     Undergraduate

  • 量子力学2演習

    2018     Undergraduate

  • 量子力学2

    2018     Undergraduate

  • 物性物理学演習

    2018     Graduate school

  • 後期特別研究

    2017     Graduate school

  • 前期特別研究

    2017     Graduate school

  • 物理学講読

    2017     Undergraduate

  • 特別実験・特別理論演習

    2017     Undergraduate

  • 量子力学2演習

    2017     Undergraduate

  • 量子力学2

    2017     Undergraduate

  • 基礎物理学Ⅱ-A

    2017     Undergraduate

  • 後期特別研究

    2016     Graduate school

  • 前期特別研究

    2016     Graduate school

  • 物理学講読

    2016     Undergraduate

  • 特別実験・特別理論演習

    2016     Undergraduate

  • 基礎物理学Ⅱ-A

    2016     Undergraduate

  • 量子力学2演習

    2016     Undergraduate

  • 量子力学2

    2016     Undergraduate

  • 理科基礎セミナー

    2016     Undergraduate

  • 後期特別研究

    2015     Graduate school

  • 前期特別研究

    2015     Graduate school

  • 物理学講読

    2015     Undergraduate

  • 特別実験・特別理論演習

    2015     Undergraduate

  • 基礎物理学Ⅱ-A

    2015     Undergraduate

  • 基礎物理学Ⅰ

    2015     Undergraduate

  • 物性物理学演習

    2015     Graduate school

  • 後期特別研究

    2014     Graduate school

  • 前期特別研究

    2014     Graduate school

  • 物理学講読

    2014     Undergraduate

  • 特別実験・特別理論演習

    2014     Undergraduate

  • 基礎物理学Ⅱ-A

    2014     Undergraduate

  • 基礎物理学Ⅰ

    2014     Undergraduate

  • 物性物理学演習

    2014     Graduate school

  • 後期特別研究

    2013     Graduate school

  • 前期特別研究

    2013     Undergraduate

  • 物理学講読

    2013     Undergraduate

  • 特別実験・特別理論演習

    2013     Undergraduate

  • 基礎物理学Ⅱ-A

    2013     Undergraduate

  • 基礎物理学Ⅰ

    2013     Undergraduate

  • 後期特別研究

    2012     Graduate school

  • 前期特別研究

    2012     Graduate school

  • 物理学講読

    2012     Undergraduate

  • 特別実験・特別理論演習

    2012     Undergraduate

  • 基礎物理学Ⅱ-E

    2012     Undergraduate

  • 基礎物理学Ⅰ

    2012     Undergraduate

  • 物性物理学演習

    2012     Graduate school

  • 量子統計力学Ⅱ

    2012     Graduate school

  • 基礎物理学Ⅰ

    2011     Undergraduate

  • 後期特別研究

    2011     Graduate school

  • 前期特別研究

    2011     Graduate school

  • 物理学講読

    2011     Undergraduate

  • 特別実験・特別理論演習

    2011     Undergraduate

  • 基礎物理学Ⅱ-E

    2011     Undergraduate

  • 物性物理学演習

    2010     Graduate school

  • 後期特別研究

    2010     Graduate school

  • 前期特別研究

    2010     Graduate school

  • 物理学講読

    2010     Undergraduate

  • 特別実験・特別理論演習

    2010     Undergraduate

  • 統計力学2演習

    2010     Undergraduate

  • 物理学基礎

    2010     Undergraduate

  • 基礎物理学Ⅱ-E

    2010     Undergraduate

  • 物質科学基礎理論Ⅱ

    2008     Undergraduate

  • 量子物質科学ゼミナール

    2008     Undergraduate

  • 量子物質科学演習

    2008     Undergraduate

  • 物質科学基礎理論Ⅱ演習

    2008     Undergraduate

  • 物質科学基礎理論Ⅰ演習

    2008     Undergraduate

  • 物質科学基礎理論Ⅰ

    2008     Undergraduate

  • 物質科学基礎理論Ⅰ

    2007     Undergraduate

  • 量子物質科学ゼミナール

    2007     Undergraduate

  • 量子物質科学演習

    2007     Undergraduate

  • 物質科学基礎理論Ⅱ演習

    2007     Undergraduate

  • 物質科学基礎理論Ⅱ

    2007     Undergraduate

  • 物質科学基礎理論Ⅰ演習

    2007     Undergraduate

  • 物質科学基礎理論Ⅰ

    2006     Undergraduate

  • 量子物質科学ゼミナール

    2006     Undergraduate

  • 量子物質科学演習

    2006     Undergraduate

  • 物質科学基礎理論Ⅱ演習

    2006     Undergraduate

  • 物質科学基礎理論Ⅱ

    2006     Undergraduate

  • 物質科学基礎理論Ⅰ演習

    2006     Undergraduate

  • 基礎物質科学実験(Brown運動)

    2005     Undergraduate

  • 量子物質科学ゼミナール

    2005     Undergraduate

  • 量子物質科学演習

    2005     Undergraduate

  • 物質科学基礎理論Ⅰ演習

    2005     Undergraduate

  • 物質科学基礎理論Ⅱ演習

    2005     Undergraduate

  • オムニバス講義「物質の構造をさぐる」

    2004     Undergraduate

  • 量子物質科学ゼミナール

    2004     Undergraduate

  • 量子物質科学演習

    2004     Undergraduate

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Charge of off-campus class subject

  • 量子力学2

    Institution:Osaka City University

  • 量子力学2演習

    Institution:Osaka City University

  • 電磁気学とその演習2

    Institution:Osaka City University

  • 基礎物理学Ⅰ

    Institution:Osaka City University

  • 基礎物理学Ⅱ-A

    Institution:Osaka City University

  • 統計力学2演習

    Institution:Osaka City University

  • 物性物理学演習

    Institution:Osaka City University

  • 量子統計力学Ⅱ

    Institution:Osaka City University

  • 基礎物理学Ⅱ-E

    Institution:Osaka City University

  • 理科基礎セミナー

    Institution:Osaka City University

  • 量子物質科学演習

    Institution:Osaka City University

  • 量子物質科学ゼミナール

    Institution:Osaka City University

  • 物理学輪読

    Institution:Osaka City University

  • 特別実験・特別理論演習

    Institution:Osaka City University

  • 基礎物質科学実験(Brown運動)

    Institution:Osaka City University

  • オムニバス講義「物質の構造をさぐる」

    Institution:Osaka City University

  • 物理学基礎

    Institution:Osaka City University

  • 物質科学基礎理論Ⅱ演習

    Institution:Osaka City University

  • 物質科学基礎理論Ⅱ

    Institution:Osaka City University

  • 物質科学基礎理論Ⅰ演習

    Institution:Osaka City University

  • 物質科学基礎理論Ⅰ

    Institution:Osaka City University

▼display all

Faculty development activities

  • FD活動への貢献  2018

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    開催されていくつかのFD研修会に参加

  • FD活動への貢献  2017

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    開催されたいくつかのFD研修会に参加

Number of instructed thesis, researches

  • 2022

    Number of instructed the graduation thesis:Number of graduation thesis reviews:2

    [Number of master's thesis reviews] (vice-chief):1

    [Number of doctoral thesis reviews] (vice-chief):1

  • 2021

    Number of instructed the graduation thesis:Number of graduation thesis reviews:2

    [Number of master's thesis reviews] (vice-chief):1

  • 2020

    Number of instructed the graduation thesis:Number of graduation thesis reviews:2

    [Number of master's thesis reviews] (vice-chief):1

  • 2019

    Number of instructed the graduation thesis:

    [Number of master's thesis reviews] (vice-chief):2

  • 2018

    [Number of master's thesis reviews] (vice-chief):2

    [Number of doctoral thesis reviews] (vice-chief):1

  • 2017

    Number of instructed the graduation thesis:

    [Number of master's thesis reviews] (vice-chief):1

  • 2016

    Number of instructed the graduation thesis:

    [Number of master's thesis reviews] (vice-chief):2

  • 2015

    Number of instructed the graduation thesis:

    [Number of master's thesis reviews] (vice-chief):3

  • 2014

    Number of instructed the graduation thesis:

  • 2013

    Number of instructed the graduation thesis:

    [Number of master's thesis reviews] (vice-chief):2

  • 2011

    [Number of master's thesis reviews] (vice-chief):1

  • 2008

    Number of instructed the graduation thesis:

  • 2007

    Number of instructed the graduation thesis:

  • 2005

    [Number of master's thesis reviews] (vice-chief):1

▼display all

Original item・Special report (Education Activity)

  • 2018

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    Original item:AP事業のTAを授業に活用した

  • 2018

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    Original item:副担任として担当学生の面接を行った

  • 2017

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    Original item:AP事業のTAを授業に活用した

  • 2017

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    Original item:副担任として担当学生の面談を行った

Social Activities

  • SSH(スーパーサイエンスハイスクール)の指導

    Role(s): Commentator, Consultant, Official expert

    大阪公立大学杉本キャンパス  2023.08

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    Audience: High school students, Teachers

    富田林高校SSHの探求テーマに対する助言を行った。

  • SSH(スーパーサイエンスハイスクール)の指導

    Role(s): Panelist, Commentator, Consultant

    大阪公立大学中百舌鳥キャンパス  2022.08

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    Audience: High school students, Teachers

    Type:Research consultation

    Number of participants:18(人)

    大阪府立富田林中学校・高等学校のSSHの研究活動に助言を行った。

  • SSH(スーパーサイエンスハイスクール)の指導

    Role(s): Consultant

    2021年度サイエンス探求最終発表会  大阪府立大手前高等学校  2021.07

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    Audience: High school students, Teachers

    Type:Cooperation with government and educational institutions

    2021年度サイエンス探求最終発表会にて、発表者への助言と発表会全体の講評を行った。

  • SSH(スーパーサイエンスハイスクール)の指導

    Role(s): Consultant

    サイエンス探究中間発表会  大阪府立大手前高等学校  2020.02

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    Audience: High school students

    Type:Research consultation

  • 教員免許状更新講習

    Role(s): Lecturer

    2018.08

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    Audience: Teachers

    Type:Certification seminar

    教員免許状更新講習にて「量子論への招待」という題目で講義を行った。またそのためのテキストを執筆した。

Media Coverage

  • 最小フェリ磁性での近藤効果には量子もつれが関与、大阪公大などが解明 Internet

    Tech+マイナビニュース  https://news.mynavi.jp/techplus/article/20220602-2357388/2  2022.06

  • A new arrangement: using quantum dots to quench the smallest ferrimagnetism Internet

    asia research news 

  • A new arrangement: using quantum dots to quench the smallest ferrimagnetism Internet

    science daily