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Dive into the research topics where Yunori Nisikawa is active.

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Featured researches published by Yunori Nisikawa.


Physical Review B | 2009

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

Takahide Numata; Yunori Nisikawa; Akira Oguri; A. C. Hewson

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


Physical Review B | 2006

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

Yunori Nisikawa; Akira Oguri

{N}_{\text{tot}}


Journal of the Physical Society of Japan | 2004

Possible Pairing Symmetry of Superconductor NaxCoO2·yH2O

Yunori Nisikawa; Hiroaki Ikeda; Kosaku Yamada

, or the level position


Journal of Magnetism and Magnetic Materials | 2007

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

Akira Oguri; Yunori Nisikawa; Yoshihide Tanaka; Takahide Numata

{ϵ}_{d}


Journal of the Physical Society of Japan | 2005

Determination of the Phase Shifts for Interacting Electrons Connected to Reservoirs

Akira Oguri; Yunori Nisikawa; A. C. Hewson

of the triple dot. The SU(4) Kondo behavior is seen in the half-filled case


Journal of the Physical Society of Japan | 2006

Theory of Superconductivity in CeMIn5 (M=Co, Rh, Ir) on the Basis of the Three Dimensional Periodic Anderson Model

Kazunori Tanaka; Hiroaki Ikeda; Yunori Nisikawa; Kosaku Yamada

{N}_{\text{tot}}\ensuremath{\simeq}3.0


Journal of the Physical Society of Japan | 2004

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

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

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


Journal of the Physical Society of Japan | 2004

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

Yunori Nisikawa; Manabu Usuda; Jun-ichi Igarashi

{N}_{\text{tot}}\ensuremath{\simeq}4.0


arXiv: Mesoscale and Nanoscale Physics | 2009

Gate-voltage dependence of Kondo effect in a triangular quantum dot

Takahide Numata; Yunori Nisikawa; Akira Oguri; A. C. Hewson

, a local


LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 | 2006

Kondo Effect in a Triple Quantum‐Dot Array

Akira Oguri; Yunori Nisikawa; A. C. Hewson

S=1

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A. C. Hewson

Imperial College London

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Manabu Usuda

Japan Atomic Energy Research Institute

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Kazunori Tanaka

Tokyo University of Science

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Akira Furukawa

Yukawa Institute for Theoretical Physics

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