Effects of trap anisotropy on impurity scattering regime in a Fermi gas

Details Effects of trap anisotropy on impurity scattering regime in a Fermi gas Effects of trap anisotropy on impurity scattering regime in a Fermi gas

2005-06-20

arxiv.org/abs/cond-mat/0506496v1

Phys. Rev. A 72, 013618 (2005)

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 4 figures, accepted for publication in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.72.013618

We evaluate the low-lying oscillation modes and the ballistic expansion properties of a harmonically trapped gas of fermionic K40 atoms containing thermal Rb87 impurities as functions of the anisotropy of the trap. Numerical results are obtained by solving the Vlasov-Landau equations for the one-body phase-space distribution functions and are used to test simple scaling Ansatzes. Starting from the gas in a weak impurity-scattering regime inside a spherical trap, the time scales associated to motions in the axial and azimuthal directions enter into competition as the trap is deformed to an elongated cigar-like shape. This competition gives rise to coexistence of collisionless and hydrodynamic behaviors in the low-lying surface modes of the gas as well as to a dependence of the aspect ratio of the expanding cloud on the collision time.

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