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Unconventional superconductivity originating from disconnected Fermi surfaces in the iron-based compound
Hideo Aoki
The iron-based LaFeAsOF recently discovered by Hosono's group is a fresh theoretical challenge as a new class of high-temperature superconductors. Here we describe the…
Photo-induced Tomonaga-Luttinger-like liquid in a Mott insulator
Takashi Oka, Hideo Aoki
Photo-induced metallic states in a Mott insulator are studied for the half-filled, one-dimensional Hubbard model with the time-dependent density matrix renormalization group. An ir…
Correlated electron systems periodically driven out of equilibrium: Floquet + DMFT formalism
Naoto Tsuji, Takashi Oka, Hideo Aoki
We propose to combine the Floquet formalism for systems in ac fields with the dynamical mean-field theory to study correlated electron systems periodically driven out of equilibriu…
Photovoltaic Hall effect in graphene
Takashi Oka, Hideo Aoki
Response of electronic systems in intense lights (AC electric fields) to DC source-drain fields is formulated with the Floquet method. We have then applied the formalism to graphen…
Electronic Structure and Electron Correlation in LaFeAsO_{1-x}F_x and LaFePO_{1-x}F_x
Walid Malaeb, Teppei Yoshida, Takashi Kataoka +10
Photoemission spectroscopy is used to investigate the electronic structure of the newly discovered iron-based superconductors LaFeAsO_{1-x}F_x and LaFePO_{1-x}F_x. Line shapes of t…
Edge states for the n=0 Laudau level in graphene
Mitsuhiro Arikawa, Yasuhiro Hatsugai, Hideo Aoki
In the anomalous quantum Hall effect (QHE), a hallmark of graphene, nature of the edge states in magnetic fields poses an important question, since the edge and bulk should be inti…
Edge states in graphene in magnetic fields -- a speciality of the edge mode embedded in the n=0 Landau band
Mitsuhiro Arikawa, Yasuhiro Hatsugai, Hideo Aoki
While usual edge states in the quantum Hall effect(QHE) reside between adjacent Landau levels, QHE in graphene has a peculiar edge mode at E=0 that reside right within the n=0 Land…
Topological low-energy modes in N=0 Landau levels of graphene: a possibility of a quantum-liquid ground state
Yasuhiro Hatsugai, Takahiro Fukui, Hideo Aoki
We point out that the zero-energy Landau level of Dirac fermions in graphene can be, in the presence of a repulsive electron-electron interaction, split into two (levels) associate…
Accurate Model of a Vertical Pillar Quantum Dot
P. A. Maksym, Y. Nishi, D. G. Austing +4
An accurate model of a vertical pillar quantum dot is described. The full three dimensional structure of the device containing the dot is taken into account and this leads to an ef…
Nonequilibrium Quantum Breakdown in a Strongly Correlated Electron System
Takashi Oka, Hideo Aoki
The nonlinear transport properties of the Mott insulator are discussed with focus on the many-body Landau-Zener mechanism. After reviewing basic concepts such as the non-adiabatic…
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…