Phonon spectrum and dynamical stability of a dilute quantum degenerate Bose-Fermi mixture.
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.
Pu
Han
H
Optical Sciences Center, The University of Arizona, Tucson, Arizona 85721, USA.
Zhang
Weiping
W
Wilkens
Martin
M
Meystre
Pierre
P