732 citations · 3.5k across the 122 of their papers we have counts for
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Superconductivty without inversion symmetry: MnSi versus CePt_3Si
P. Frigeri, D. F. Agterberg, A. Koga +1
Superconductivity in materials without spatial inversion symmetry is studied. We show that in contrast to common believe, spin-triplet pairing is not entirely excluded in such syst…
Hole Dynamics in the Orthogonal-Dimer Spin System
Y. Saito, A. Koga, N. Kawakami
The dynamics of a doped hole in the orthogonal-dimer spin system is investigated systematically in one, two and three dimensions. By combining the bond-operator method with the sel…
Effects of degenerate orbitals on the Hubbard model
Akihisa Koga, Takuma Ohashi, Yoshiki Imai +2
Stability of a metallic state in the two-orbital Hubbard model at half-filling is investigated. We clarify how spin and orbital fluctuations are enhanced to stabilize the formation…
Hole-Doping Effects on a Two-dimensional Kondo Insulator
Y. Saito, A. Koga, N. Kawakami
We study the effects of hole doping on the two-dimensional Heisenberg-Kondo model around the quantum critical point, where the spin liquid phase (Kondo insulator) and the magnetica…