1.7k citations · 11.2k across the 179 of their papers we have counts for
12 papers · 1 filter
Integer quantum Hall effect and Hofstadter's butterfly spectra in three-dimensional metals in external periodic modulations
Mikito Koshino, Hideo Aoki
We propose that Hofstadter's butterfly accompanied by quantum Hall effect that is similar to those predicted to occur in 3D tight-binding systems by Koshino {\it et al.} [Phys. Rev…
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…
Interaction and dimensionality in the quantum Hall physics
Hideo Aoki
While the composite fermion picture is so effective as to describe the excitation spectra including the spin wave for Laughlin's quantum liquid, ``how heavy and how strongly-intera…
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},…
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…