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Odd-frequency Superconductivity on a Quasi-one-dimensional Triangular Lattice in the Hubbard Model
Keisuke Shigeta, Seiichiro Onari, Keiji Yada +1
In order to clarify whether the odd-frequency superconductivity can be realized or not, we study a quasi-one-dimensional triangular lattice in the Hubbard model using the random ph…
A Microscopic Theory of Odd-freqeuncy Pairing in the Two-dimensional Extended Hubbard Model
Keiji Yada, Seiichiro Onari, Yukio Tanaka +1
We present a microscopic theory of fluctuation-mediated pairing mechanism in a two-dimensional extended Hubbard model. In contrast to conventional wisdom, odd-frequency spin-triple…
Intrinsic spin Hall effect in graphene: Numerical calculations in a multi-orbital mode
Seiichiro Onari, Yasuhito Ishikawa, Hiroshi Kontani +1
We study the spin Hall effect (SHE) in graphene using a realistic multi-orbital tight-binding model that includes the atomic spin-orbit interaction. The SHE is found to be induced…
Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsOF}
Kazuhiko Kuroki, Seiichiro Onari, Ryotaro Arita +4
For a newly discovered iron-based high superconductor LaFeAsOF, we have constructed a minimal model, where inclusion of all the five Fe bands is found to be n…