Trapped Phase-Segregated Bose-Fermi Mixtures and their Collective Excitations

Abstract

Recent progress in the field of ultracold gases has allowed the creation of phase-segregated Bose-Fermi systems. We present a theoretical study of their collective excitations at zero temperature. As the fraction of fermion to boson particle number increases, the collective mode frequencies take values between those for a fully bosonic and those for a fully fermionic cloud, with damping in the intermediate region. This damping is caused by fermions which are resonantly driven at the interface.

6 pages, 4 figures, accepted for publication in Phys. Rev. A

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