Pair correlations of an expanding superfluid Fermi gas
Pair correlations of an expanding superfluid Fermi gas
The pair correlation function of an expanding gas is investigated with an emphasis on the BEC-BCS crossover of a superfluid Fermi gas at zero temperature. At unitarity quantum Monte Carlo simulations reveal the occurrence of a sizable bunching effect due to interactions in the spin up-down channel which, at short distances, is larger than that exhibited by thermal bosons in the Hanbury-Brown–Twiss effect. We propose a local equilibrium ansatz for the pair correlation function which we predict will remain isotropic during the expansion even if the trapping potential is anisotropic, in contrast with the behavior of the density. The isotropy of the pair correlation function is an experimentally accessible signature, which makes a clear distinction with respect to the case of noninteracting gases and can be understood as a consequence of the violation of scaling
100405-[4pp]
Lobo, C.
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Carusotto, I.
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Giorgini, S.
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Recati, A.
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Stringari, S.
76042105-4119-4bbd-9680-1b2314e497d9
8 September 2006
Lobo, C.
cde7843a-c00b-4242-a8cd-1abb2dfe0703
Carusotto, I.
2205328f-fe28-4720-9283-c72e08e35800
Giorgini, S.
b0a1b36d-128c-4d7b-8794-1d247f539647
Recati, A.
4f2a6759-f4f7-4bc7-819e-027ff21a56a5
Stringari, S.
76042105-4119-4bbd-9680-1b2314e497d9
Lobo, C., Carusotto, I., Giorgini, S., Recati, A. and Stringari, S.
(2006)
Pair correlations of an expanding superfluid Fermi gas.
Physical Review Letters, 97 (10), .
(doi:10.1103/PhysRevLett.97.100405).
Abstract
The pair correlation function of an expanding gas is investigated with an emphasis on the BEC-BCS crossover of a superfluid Fermi gas at zero temperature. At unitarity quantum Monte Carlo simulations reveal the occurrence of a sizable bunching effect due to interactions in the spin up-down channel which, at short distances, is larger than that exhibited by thermal bosons in the Hanbury-Brown–Twiss effect. We propose a local equilibrium ansatz for the pair correlation function which we predict will remain isotropic during the expansion even if the trapping potential is anisotropic, in contrast with the behavior of the density. The isotropy of the pair correlation function is an experimentally accessible signature, which makes a clear distinction with respect to the case of noninteracting gases and can be understood as a consequence of the violation of scaling
Text
PhysRevLett.97.100405.pdf
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Published date: 8 September 2006
Organisations:
Applied Mathematics
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Local EPrints ID: 205907
URI: http://eprints.soton.ac.uk/id/eprint/205907
PURE UUID: 4fffc5fc-5cbe-4b4b-af1b-8c9da2a1ce3a
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Date deposited: 15 Dec 2011 09:34
Last modified: 15 Mar 2024 03:32
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Author:
I. Carusotto
Author:
S. Giorgini
Author:
A. Recati
Author:
S. Stringari
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