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7 papers · 1 filter
Stability of superfluid Fermi gases in optical lattices
Yoshihiro Yunomae, Ippei Danshita, Daisuke Yamamoto +2
Critical velocities of superfluid Fermi gases in optical lattices are theoretically investigated across the BCS-BEC crossover. We calculate the excitation spectra in the presence o…
Tunneling properties of a bound pair of Fermi atoms in an optical lattice
Yoji Ohashi
We investigate tunneling properties of a bound pair of Fermi atoms in an optical lattice, comparing with results obtained in an attractive Hubbard model. In the strong coupling reg…
Supercurrent behavior of low-energy Bogoliubov phonon and anomalous tunneling effect in a Bose-Einstein condensate
Yoji Ohashi, Shunji Tsuchiya
We investigate tunneling properties of Bogoliubov mode in a Bose-Einstein condensate. Using an exactly solvable model with a delta-functional barrier, we show that each component i…
Anomalous enhancement of quasiparticle current near a potential barrier in a Bose-Einstein condensate
S. Tsuchiya, Y. Ohashi
We investigate tunneling properties of Bogoliubov phonons in a Bose-Einstein condensate. We find the anomalous enhancement of the quasiparticle current carried by Bogol…
Spin-polarized Fermi superfluids as Bose-Fermi mixtures
E. Taylor, A. Griffin, Y. Ohashi
In the strong-coupling BEC region where a Feshbach resonance gives rise to tightly-bound dimer molecules, we show that a spin-polarized Fermi superfluid reduces to a simple Bose-Fe…
Pairing fluctuations and the superfluid density through the BCS-BEC crossover
E. Taylor, A. Griffin, N. Fukushima +1
We derive an expression for the superfluid density of a uniform two-component Fermi gas through the BCS-BEC crossover in terms of the thermodynamic potential in the presence of an…