Yunori Nisikawa
Osaka City University
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Featured researches published by Yunori Nisikawa.
Physical Review B | 2009
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
Yunori Nisikawa; Akira Oguri
{N}_{\text{tot}}
Journal of the Physical Society of Japan | 2004
Yunori Nisikawa; Hiroaki Ikeda; Kosaku Yamada
, or the level position
Journal of Magnetism and Magnetic Materials | 2007
Akira Oguri; Yunori Nisikawa; Yoshihide Tanaka; Takahide Numata
{ϵ}_{d}
Journal of the Physical Society of Japan | 2005
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
Kazunori Tanaka; Hiroaki Ikeda; Yunori Nisikawa; Kosaku Yamada
{N}_{\text{tot}}\ensuremath{\simeq}3.0
Journal of the Physical Society of Japan | 2004
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
Yunori Nisikawa; Manabu Usuda; Jun-ichi Igarashi
{N}_{\text{tot}}\ensuremath{\simeq}4.0
arXiv: Mesoscale and Nanoscale Physics | 2009
Takahide Numata; Yunori Nisikawa; Akira Oguri; A. C. Hewson
, a local
LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 | 2006
Akira Oguri; Yunori Nisikawa; A. C. Hewson
S=1