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Effects of trap anisotropy on impurity scattering regime in a Fermi gas | | P. Capuzzi
; P. Vignolo
; M. P. Tosi
; | | Date: |
20 Jun 2005 | | Subject: | Soft Condensed Matter | cond-mat.soft | | Affiliation: | SNS, Italy | | Abstract: | 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. | | Source: | arXiv, cond-mat/0506496 | | Services: | Forum | Review | PDF | Favorites | |
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