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Impurity effect in multi-orbital, sign-reversing s-wave superconductors
Yuki Nagai, Kazuhiko Kuroki, Masahiko Machida +1
We study the impurity effects on the transition temperature Tc with use of the T-matrix approximation. We propose a way to visualize the multi-orbital effect by introducing the hyb…
Non-equilibrium superconductivity in a correlated electron system studied with the Keldysh+FLEX approach
Takashi Oka, Hideo Aoki
Non-equilibrium phase transitions are studied theoretically for the two-dimensional Hubbard model subject to bias voltages from the electrodes coupled to the system. By combining t…
Anomalous criticality in the quantum Hall transition at Landau level of graphene with chiral-symmetric disorders
Tohru Kawarabayashi, Takahiro Morimoto, Yasuhiro Hatsugai +1
We investigate numerically whether the chiral symmetry is the sole factor dominating the criticality of the quantum Hall transitions in disordered graphene. When the disorder respe…
Collective modes in multiband superfluids and superconductors: Multiple dynamical classes
Yukihiro Ota, Masahiko Machida, Tomio Koyama +1
One important way to characterize the states having a gauge symmetry spontaneously broken over multibands should be to look at their collective excitation modes. We find that a thr…
Phase-separated Ferromagnetism in Spin-imbalanced Fermi Atoms Loaded on an Optical Ladder: a DMRG study
M. Okumura, S. Yamada, M. Machida +1
We consider repulsively-interacting cold fermionic atoms loaded on an optical ladder lattice in a trapping potential. The density-matrix renormalization-group method is used to num…
Dynamical band flipping in fermionic lattice systems: An ac-field-driven change of the interaction from repulsive to attractive
Naoto Tsuji, Takashi Oka, Philipp Werner +1
We show theoretically that the sudden application of an appropriate ac field to correlated lattice fermions flips the band structure and effectively switches the interaction from r…
Half-integer contributions to the quantum Hall conductivity from single Dirac cones
Haruki Watanabe, Yasuhiro Hatsugai, Hideo Aoki
While the quantum Hall effect in graphene has been regarded as a realization of the anomaly associated with the massless Dirac particle carrying half the usual topological integer,…
All Optical Measurement Proposed for the Photovoltaic Hall Effect
Takashi Oka, Hideo Aoki
We propose an all optical way to measure the recently proposed "photovoltaic Hall effect", i.e., a DC Hall effect induced by a circularly polarized light in the absence of static m…
Proposal for a magnetic field induced graphene dot
P. A. Maksym, M. Roy, M. F. Craciun +3
Quantum dots induced by a strong magnetic field applied to a single layer of graphene in the perpendicular direction are investigated. The dot is defined by a model potential which…
Dynamical scaling analysis of the optical Hall conductivity in the quantum Hall regime
Takahiro Morimoto, Yshai Avishai, Hideo Aoki
Dynamical scaling analysis is theoretically performed for the ac (optical) Hall conductivity as a function of Fermi energy and frequency $…
Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor
Hirofumi Sakakibara, Hidetomo Usui, Kazuhiko Kuroki +2
In order to explore the reason why the single-layered cuprates, La(Sr/Ba)CuO ( 40K) and HgBaCuO ( 90K), have such a significant di…