Collective Excitations of Trapped Imbalanced Fermion Gases

Abstract

We present a theoretical study of the collective excitations of a trapped imbalanced fermion gas at unitarity, when the system consists of a superfluid core and a normal outer shell. We formulate the relevant boundary conditions and treat the normal shell both hydrodynamically and collisionlessly. For an isotropic trap, we calculate the mode frequencies as a function of trap polarization. Out-of-phase modes with frequencies below the trapping frequency are obtained for the case of a hydrodynamic normal shell. For the collisionless case, we calculate the monopole mode frequencies, and find that all but the lowest mode may be damped.

arXiv comment4 pages; accepted for publication in PRA

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Cited by in corpus (12)

• Ultra-cold Polarized Fermi Gases
• Interface Tension of Bose-Einstein Condensates
• Superfluid hydrodynamics in the inner crust of neutron stars
• Trapped Phase-Segregated Bose-Fermi Mixtures and their Collective Excitations
• Normal-Superfluid Interface for Polarized Fermion Gases
• Collective modes as a probe of imbalanced Fermi gases
• Superfluidity of a spin-imbalanced Fermi gas in a three-dimensional optical lattice
• Dipole Oscillations in Fermionic Mixtures
• Collective Modes in the Superfluid Inner Crust of Neutron Stars
• BEC immersed in a Fermi sea: Theory of static and dynamic behavior across phase separation
• Collective excitations of an imbalanced fermion gas in a 1D optical lattice
• Collective Excitations of Harmonically Trapped Ideal Gases