Drag in Bose-Fermi mixtures

We use kinetic theory to model the dynamics of a small Bose condensed cloud of heavy particles moving through a larger degenerate Fermi gas of light particles. Varying the Bose-Fermi interaction, we find a crossover between bulk- and surface-dominated regimes-where scattering occurs throughout the Bose cloud or solely on the surface, respectively. We calculate the damping and frequency shift of the dipole mode in a harmonic trap as a function of the magnetic field controlling an interspecies Feshbach resonance. We find excellent agreement between our stochastic model and the experimental studies of Cs-Li mixtures.

Automated summary

Using kinetic theory, we modeled the dynamics of a small Bose condensed cloud of heavy particles moving through a larger degenerate Fermi gas of light particles. By varying the Bose-Fermi interaction, we observed a transition between bulk- and surface-dominated regimes. Our calculations of the dipole mode in a harmonic trap showed excellent agreement with experimental studies of Cs-Li mixtures, confirming the accuracy of our stochastic model.