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Phase diagram for the one-dimensional Hubbard-Holstein model: A density-matrix renormalization group study
Masaki Tezuka, Ryotaro Arita, Hideo Aoki
Phase diagram of the Hubbard-Holstein model in the coexistence of electron-electron and electron-phonon interactions has been theoretically obtained with the density-matrix renorma…
Flat-band ferromagnetism proposed for an organic polymer crystal
Ryotaro Arita, Yuji Suwa, Kazuhiko Kuroki +1
Motivated from the flat-band ferromagnetism conceived theoretically for a single chain of five membered rings (polyaminotriazole) by Arita {\it et al.}, [Phys. Rev. Lett. {\bf 88},…
Magnetic-field induced triplet superconductivity in the Hubbard model on a triangular lattice
Ryotaro Arita, Kazuhiko Kuroki, Hideo Aoki
We propose theoretically that a magnetic field can realize spin-triplet superconductivity in repulsively interacting electron systems having strong ferromagnetic spin fluctuations.…