Dipole oscillation of a trapped Bose--Fermi-mixture gas in collisionless and hydrodynamic regimes

Abstract

Dipole oscillation is studied in a normal phase of a trapped Bose--Fermi-mixture gas composed of single-species bosons and single-species fermions. Applying the moment method to the linearized Boltzmann equation, we derive a closed set of equations of motion for the center-of-mass position and momentum of both components. By solving the coupled equations, we reveal the behavior of dipole modes in the transition between the collisionless regime and the hydrodynamic regime. We find that two oscillating modes in the collisionless regime have distinct fates in the hydrodynamic regime: one collisionless mode shows a crossover to a hydrodynamic in-phase mode, and the other collisionless mode shows a transition to two purely damped modes. The temperature dependence of these dipole modes are also discussed.

arXiv comment10 pages, 5 figures

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Cited by in corpus (5)

• Dynamics of a degenerate Cs-Yb mixture with attractive interspecies interactions
• Dipole modes of a trapped bosonic mixture: Fate of the sum-rule approach
• Dipole-Mode Spectrum and Hydrodynamic Crossover in a Resonantly Interacting Two-Species Fermion Mixture
• Collective excitations of a Bose-condensed gas: Fate of second sound in the crossover regime between hydrodynamic and collisionless regimes
• Dipole Mode of Trapped Bose--Fermi Mixture Gas