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17 papers · 1 filter
Phase diagram of the two-dimensional extended Hubbard model: Phase transitions between different pairing symmetries when charge and spin fluctuations coexist
Seiichiro Onari, Ryotaro Arita, Kazuhiko Kuroki +1
In order to explore how superconductivity arises when charge fluctuations and spin fluctuations coexist, we have obtained a phase diagram against the off-site repulsion V and band…
Possible spin-triplet -wave pairing due to disconnected Fermi surfaces in NaCoOHO
Kazuhiko Kuroki, Yukio Tanaka, Ryotaro Arita
We propose that spin-triplet pairing mechanism due to disconnected Fermi surfaces proposed in our previous study [Phys. Rev. B {\bf 63} 174507 (2001)] may be at work in a recently…
Josephson effect in quasi one-dimensional unconventional superconductors
Y. Asano, Y. Tanaka, Y. Tanuma +2
Josephson effect in junctions of quasi one-dimensional triangular lattice superconductors is discussed, where the theoretical model corresponds to organic superconductors (TMTSF)_2…
Electronic properties of metal induced gap states at insulator/metal interfaces -- dependence on the alkali halide and the possibility of excitonic mechanism of superconductivity
Ryotaro Arita, Yoshiaki Tanida, Kazuhiko Kuroki +1
Motivated from the experimental observation of metal induced gap states (MIGS) at insulator/metal interfaces by Kiguchi {\it et al.} [Phys. Rev. Lett. {\bf 90}, 196803 (2003)], we…
Flat-Band Ferromagnetism in Organic Polymers Designed by a Computer Simulation
Yuji Suwa, Ryotaro Arita, Kazuhiko Kuroki +1
By coupling a first-principles, spin-density functional calculation with an exact diagonalization study of the Hubbard model, we have searched over various functional groups for th…
Electronic structure of periodic curved surfaces -- continuous surface versus graphitic sponge
H. Aoki, M. Koshino, D. Takeda +2
We investigate the band structure of electrons bound on periodic curved surfaces. We have formulated Schrödinger's equation with the Weierstrass representation when the surface is…