Potsdam University Potsdam Quantum Optics Group

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H. Pu, W. Zhang, M. Wilkens, and P. Meystre
Phonon spectrum and dynamical stability of a dilute quantum degenerate Bose-Fermi Mixture
Phys. Rev. Lett. 88 (2002) 070408


    We calculate the phonon excitation spectrum in a zero-temperature dilute boson-fermion gaseous 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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