Issue
EPL
Volume 88, Number 3, November 2009
Article Number 30009
Number of page(s) 6
Section General
DOI http://dx.doi.org/10.1209/0295-5075/88/30009
Published online 17 November 2009
EPL, 88 (2009) 30009
DOI: 10.1209/0295-5075/88/30009

Dipole oscillations of a Fermi gas in a disordered trap: Damping and localization

L. Pezzè, B. Hambrecht and L. Sanchez-Palencia

Laboratoire Charles Fabry de l'Institut d'Optique, CNRS and Univ. Paris-Sud, Campus Polytechnique RD 128, F-91127 Palaiseau cedex, France, EU

lsp@institutoptique.fr

received 31 July 2009; accepted in final form 13 October 2009; published November 2009
published online 17 November 2009

Abstract
We theoretically 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 show that damping results from a dephasing effect related to weak random perturbations of the energy spectrum. For increasing disorder, we show that the Fermi gas crosses over to an insulating regime characterized by strong damping due to the proliferation of localized states.

PACS
03.75.-b - Matter waves.
03.75.Ss - Degenerate Fermi gases.

© EPLA 2009