Phonon spectrum and dynamical stability of a quantum degenerate Bose-Fermi mixture

Physics – Condensed Matter – Soft Condensed Matter

Scientific paper

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4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.88.070408

We calculate the phonon excitation spectrum in a zero-temperature
boson-fermion mixture. We show how the sound velocity changes due to the
boson-fermion interaction and we determine the dynamical stability regime of a
homogeneous mixture. We identify a resonant phonon-exchange interaction between
the fermions as the physical mechanism leading to the instability.

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