Frequency shift and mode coupling of the collective modes of superfluid Fermi gases in the BCS-BEC crossover
- Department of Physics and Institute of Theoretical Physics, East China Normal University, Shanghai 200062 (China)
We investigate the dynamical behavior of large-amplitude collective modes in a superfluid Fermi gas in the crossover from Bardeen-Cooper-Schrieffer (BCS) superfluid to Bose-Einstein condensate (BEC) based on a hydrodynamic approach. We first solve the superfluid hydrodynamic equations that describe the time evolution of fermionic condensates in the BCS-BEC crossover and calculate explicitly the frequency shifts of the collective modes induced by nonlinear effects using the Lindstedt-Poincare method. The result shows that the frequency shifts display different features in different superfluid regimes. We then study the second-harmonic generation of the collective modes under a phase-matching condition, which can be fulfilled by choosing appropriate parameters of the system. The analytical results obtained are checked by numerical simulations and good agreement is found.
- OSTI ID:
- 21143107
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 77, Issue 10; Other Information: DOI: 10.1103/PhysRevB.77.104527; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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