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Aspects of superfluid cold atomic gases in optical lattices | | Gentaro Watanabe
; Sukjin Yoon
; | | Date: |
15 Jan 2013 | | Abstract: | We review our studies on Bose and Fermi superfluids of cold atomic gases in
optical lattices at zero temperature. Especially, we focus on superfluid Fermi
gases along the crossover between the Bardeen-Cooper-Schrieffer (BCS) and the
Bose-Einstein condensate (BEC) states, which enables us to study the Bose and
Fermi superfluids in a unified point of view. We discuss basic static and
long-wavelength properties (such as equation of state, incompressibility, and
effective mass), energetic stability, and energy band structures of the
superfluid Fermi gases in an optical lattice periodic along one spatial
direction. The periodic potential makes pairs of atoms to be strongly bound,
and this can affect the static and long-wavelength properties and the stability
of the superflow. Regarding the band structure, a peculiar loop structure
called "swallowtail" can appear in superfluid Fermi gases as well as in the
Bose case while its mechanism of the emergence is very different from the
bosonic counterpart. Other quantum phases that the cold atomic gases in optical
lattices can show are also briefly discussed from their role as quantum
simulators of the Hubbard models. | | Source: | arXiv, 1301.3363 | | Services: | Forum | Review | PDF | Favorites | |
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