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Collision of two spin-polarized fermionic clouds

Collision of two spin-polarized fermionic clouds
Collision of two spin-polarized fermionic clouds
We study the collision of two spin-polarized Fermi clouds in a harmonic trap using a simulation of the Boltzmann equation. As observed in recent experiments, we find three distinct regimes of behavior. For weak interactions the clouds pass through each other. If interactions are increased they approach each other exponentially and for strong interactions they bounce off each other several times. We thereby demonstrate that all these phenomena can be reproduced using a semiclassical collisional approach and that these changes in behavior are associated with an increasing collision rate. We then show that the oscillation of the clouds in the bounce regime is an example of an unusual case in quantum gases: a nonlinear coupling between collective modes, namely, the spin dipole mode and the axial breathing mode, which is enforced by collisions. We also determine the frequency of the bounce as a function of the final temperature of the equilibrated system
1050-2947
051605-[4pp]
Goulko, O.
f10f3427-6071-487a-aa3e-711cf667bee3
Chevy, F.
d2547f1d-c477-43df-907a-e7647c76cd3a
Lobo, C.
cde7843a-c00b-4242-a8cd-1abb2dfe0703
Goulko, O.
f10f3427-6071-487a-aa3e-711cf667bee3
Chevy, F.
d2547f1d-c477-43df-907a-e7647c76cd3a
Lobo, C.
cde7843a-c00b-4242-a8cd-1abb2dfe0703

Goulko, O., Chevy, F. and Lobo, C. (2011) Collision of two spin-polarized fermionic clouds. Physical Review A, 84 (5), 051605-[4pp]. (doi:10.1103/PhysRevA.84.051605).

Record type: Article

Abstract

We study the collision of two spin-polarized Fermi clouds in a harmonic trap using a simulation of the Boltzmann equation. As observed in recent experiments, we find three distinct regimes of behavior. For weak interactions the clouds pass through each other. If interactions are increased they approach each other exponentially and for strong interactions they bounce off each other several times. We thereby demonstrate that all these phenomena can be reproduced using a semiclassical collisional approach and that these changes in behavior are associated with an increasing collision rate. We then show that the oscillation of the clouds in the bounce regime is an example of an unusual case in quantum gases: a nonlinear coupling between collective modes, namely, the spin dipole mode and the axial breathing mode, which is enforced by collisions. We also determine the frequency of the bounce as a function of the final temperature of the equilibrated system

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Published date: 28 November 2011
Organisations: Applied Mathematics

Identifiers

Local EPrints ID: 205895
URI: http://eprints.soton.ac.uk/id/eprint/205895
ISSN: 1050-2947
PURE UUID: 5ad1e171-f543-464d-95ed-93e59e4f85f6
ORCID for C. Lobo: ORCID iD orcid.org/0000-0001-7060-3905

Catalogue record

Date deposited: 14 Dec 2011 15:34
Last modified: 15 Mar 2024 03:32

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Contributors

Author: O. Goulko
Author: F. Chevy
Author: C. Lobo ORCID iD

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