Umklapp collisions and center of mass oscillation of a trapped Fermi gas

Details Umklapp collisions and center of mass oscillation of a trapped Fermi gas Umklapp collisions and center of mass oscillation of a trapped Fermi gas

2004-02-20

arxiv.org/abs/cond-mat/0402532v2

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 3 figures, corrected typos

Scientific paper

10.1103/PhysRevLett.93.020404

Starting from the the Boltzmann equation, we study the center of mass oscillation of a harmonically trapped normal Fermi gas in the presence of a one-dimensional periodic potential. We show that for values of the the Fermi energy above the first Bloch band the center of mass motion is strongly damped in the collisional regime due to umklapp processes. This should be contrasted with the behaviour of a superfluid where one instead expects the occurrence of persistent Josephson-like oscillations.

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