22 citations · 87 across the 9 of their papers we have counts for
4 papers · 1 filter
Numerical renormalization group approach to a quartet quantum-dot array connected to reservoirs:gate-voltage dependence of the conductance
Yunori Nisikawa, Akira Oguri
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 non-int…
A Mechanism of Spin-Triplet Superconductivity in Hubbard Model on Triangular La ttice: Application to UNi_2Al_3
Yunori Nisikawa, Kosaku Yamada
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…
Perturbation Theory on the Superconductivity of Heavy Fermion Superconductors CeIr_{x}Co_{1-x}In_5
Yunori Nisikawa, Hiroaki Ikeda, Kosaku Yamada
We reformulate the Eliashberg's equation for the superconducting transition within the quasi-particle description, which takes account of the heavy electron mass. We discuss the su…
Perturbation Theory on the Superconductivity of Heavy Fermion Superconductor UPd_2Al_3
Yunori Nisikawa, Kosaku Yamada
We investigate the superconducting mechanism and the transition temperature of heav y fermion superconductor UPd_2Al_3 on the basis of a single band two-dimensional Hubbard model o…