Sound waves and dynamics of superfluid Fermi gases in optical lattices

Journal Article · Thu Oct 15 00:00:00 EDT 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.80.043617· OSTI ID:21316454

Aixia, Zhang; Jukui, Xue ^[1]

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1. Physics and Electronics Engineering College, Northwest Normal University, Lanzhou 730070 (China)

The sound waves, the stability of Bloch waves, the Bloch oscillation, and the self-trapping phenomenon in interacting two-component Fermi gases throughout the BEC-BCS crossover in one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) optical lattices are discussed in detail. Within the hydrodynamical theory and by using the perturbative and tight-binding approximation, sound speed in both weak and tight 1D, 2D, 3D optical lattices, and the criteria for occurrences of instability of Bloch waves and self-trapping of Fermi gases along the whole BEC-BCS crossover in tight 1D, 2D, 3D optical lattices are obtained analytically. The results show that the sound speed, the criteria for occurrences of instability of Bloch waves and self-trapping, and the destruction of Bloch oscillation are modified dramatically by the lattice parameters (lattice dimension and lattice strength), the atom density or atom number, and the atom interaction.

• OSTI ID: 21316454
• Journal Information: Physical Review. A, Vol. 80, Issue 4; Other Information: DOI: 10.1103/PhysRevA.80.043617; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
APPROXIMATIONS
ATOMS
BCS THEORY
BOSE-EINSTEIN CONDENSATION
FERMI GAS
FERMIONS
LATTICE PARAMETERS
ONE-DIMENSIONAL CALCULATIONS
OSCILLATIONS
PERTURBATION THEORY
SOUND WAVES
SUPERFLUIDITY
THREE-DIMENSIONAL CALCULATIONS
TRAPPING
TWO-DIMENSIONAL CALCULATIONS