141 citations · 589 across the 20 of their papers we have counts for
20 papers
Quantum anomalous Hall effect driven by magnetic proximity coupling in all-telluride based heterostructure
Ryota Watanabe, Ryutaro Yoshimi, Minoru Kawamura +7
The quantum anomalous Hall effect (QAHE) is an exotic quantum phenomenon originating from dissipation-less chiral channels at the sample edge. While the QAHE has been observed in m…
Uniform spin susceptibility and spin-gap phenomenon in the BCS-BEC crossover regime of an ultracold Fermi gas
H. Tajima, T. Kashimura, R. Hanai +2
We investigate the uniform spin susceptibility in the BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einstein condensation) crossover regime of an ultracold Fermi gas. Inclu…
Pseudogap phenomenon and effects of population imbalance in the normal state of a unitary Fermi gas
Takashi Kashimura, Ryota Watanabe, Yoji Ohashi
We investigate strong-coupling corrections to single-particle excitations in the normal state of a spin-polarized unitary Fermi gas. Within the framework of an extended T-matrix ap…
Excitation properties and effects of mass imbalance in the BCS-BEC crossover regime of an ultracold Fermi gas
Ryo Hanai, Takashi Kashimura, Ryota Watanabe +2
We investigate single-particle properties of a mass-imbalanced Fermi gas in the BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einstein condensation) crossover region. In the presence o…
Low-dimensional pairing fluctuations and pseudogapped photoemission spectrum in a trapped two-dimensional Fermi gas
Ryota Watanabe, Shunji Tsuchiya, Yoji Ohashi
We investigate strong-coupling properties of a trapped two-dimensional normal Fermi gas. Within the framework of a combined -matrix theory with the local density approximation,…
Spin Susceptibility and Strong Coupling Effects in an Ultracold Fermi Gas
Hiroyuki Tajima, Ryo Hanai, Ryota Watanabe +1
We investigate magnetic properties and strong coupling corrections in the BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einstein condensation) crossover regime of an ultracold Fermi ga…
Coexistence of superfluid gap and pseudogap in the BCS-BEC crossover regime of a trapped Fermi gas below
Ryota Watanabe, Shunji Tsuchiya, Yoji Ohashi
We investigate strong pairing fluctuations and effects of a harmonic trap in the superfluid phase of an ultracold Fermi gas. Including amplitude and phase fluctuations of the inhom…
Spin susceptibility and fluctuation corrections in the BCS-BEC crossover regime of an ultracold Fermi gas
Takashi Kashimura, Ryota Watanabe, Yoji Ohashi
We investigate magnetic properties and effects of pairing fluctuations in the BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einstein condensation) crossover regime of an ultracold Ferm…
Superfluid phase transition and strong-coupling effects in an ultracold Fermi gas with mass imbalance
Ryo Hanai, Takashi Kashimura, Ryota Watanabe +2
We investigate the superfluid phase transition and effects of mass imbalance in the BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einstein condensation) crossover regime of an cold Fer…
Magnetic properties and strong-coupling corrections in an ultracold Fermi gas with population imbalance
Takashi Kashimura, Ryota Watanabe, Yoji Ohashi
We investigate magnetic properties of an ultracold Fermi gas with population imbalance. In the presence of population imbalance, the strong-coupling theory developed by Nozieres an…
Two-dimensional pseudogap effects of an ultracold Fermi gas in the BCS-BEC crossover region
Ryota Watanabe, Shunji Tsuchiya, Yoji Ohashi
We investigate pseudogap phenomena originating from pairing fluctuations in the BCS-BEC crossover regime of a two-dimensional Fermi gas in a harmonic trap. Including pairing fluctu…
Pseudogap phenomenon in an ultracold Fermi gas with a p-wave pairing interaction
D. Inotani, R. Watanabe, M. Sigrist +1
We investigate single-particle properties of a one-component Fermi gas with a tunable p-wave interaction. Including pairing fluctuations associated with this anisotropic interactio…
Pseudogap temperature and effects of a harmonic trap in the BCS-BEC crossover regime of an ultracold Fermi gas
Shunji Tsuchiya, Ryota Watanabe, Yoji Ohashi
We theoretically investigate excitation properties in the pseudogap regime of a trapped Fermi gas. Using a combined -matrix theory with the local density approximation, we calcu…
Inhomogeneous Pseudogap Phenomenon in the BCS-BEC Crossover Regime of a Trapped Superfluid Fermi Gas
Ryota Watanabe, Shunji Tsuchiya, Yoji Ohashi
We investigate pseudogap phenomena in the unitarity limit of a trapped superfluid Fermi gas. Including effect of strong pairing fluctuations within a -matrix approximation, as w…
Theory of Photoemission-type Experiment in the BCS-BEC Crossover Regime of a Superfluid Fermi Gas
Ryota Watanabe, Shunji Tsuchiya, Yoji Ohashi
We theoretically investigate the recent photoemission-type experiment on K Fermi gases done by JILA group. Including pairing fluctuations within a strong-coupling -matrix…
Superfluid density of states and pseudogap phenomenon in the BCS-BEC crossover regime of a superfluid Fermi gas
Ryota Watanabe, Shunji Tsuchiya, Yoji Ohashi
We investigate single-particle excitations and strong-coupling effects in the BCS-BEC crossover regime of a superfluid Fermi gas. Including phase and amplitude fluctuations of the…
Photoemission spectrum and effect of inhomogeneous pairing fluctuations in the BCS-BEC crossover regime of an ultracold Fermi gas
Shunji Tsuchiya, Ryota Watanabe, Yoji Ohashi
We investigate the photoemission-type spectrum in a cold Fermi gas which was recently measured by JILA group [J. T. Stewart {\it et al}., Nature \textbf{454}, 744 (2008)]. This qua…
Transition from Band insulator to Bose-Einstein Condensate superfluid and Mott State of Cold Fermi Gases with Multiband Effects in Optical Lattices
Ryota Watanabe, Masatoshi Imada
We study two models realized by two-component Fermi gases loaded in optical lattices. We clarify that multi-band effects inevitably caused by the optical lattices generate a rich s…
Single-particle properties and pseudogap effects in the BCS-BEC crossover regime of an ultracold Fermi gas above Tc
Shunji Tsuchiya, Ryota Watanabe, Yoji Ohashi
We investigate strong-coupling effects on normal state properties of an ultracold Fermi gas. Within the framework of -matrix approximation in terms of pairing fluctuations, we c…
Pseudogap in fermionic density of states in the BCS-BEC crossover of atomic Fermi gases
S. Tsuchiya, R. Watanabe, Y. Ohashi
We study pseudogap behaviors of ultracold Fermi gases in the BCS-BEC crossover region. We calculate the density of states (DOS), as well as the single-particle spectral weight, abo…