Dipole Oscillations of a Fermi Gas in a Disordered Trap: Damping and Localization
Résumé
We study the dipole oscillations of an ideal Fermi gas in a disordered trap. We show that even weak disorder induces strong damping of the oscillations and we identify a metal-insulator crossover: For very weak disorder, we find under-damping and show that it results from weak random perturbations of the energy spectrum. For increasing disorder, we show that the Fermi gas crosses over to a strongly insulating regime characterized by over-damping resulting from the proliferation of localized states.