Pair correlations of an expanding superfluid fermi gas
Year: 2006
Authors: Lobo C., Carusotto I., Giorgini S., Recati A., Stringari S.
Autors Affiliation: Dipartimento di Fisica, Università di Trento and CNR-INFM BEC Center, I-38050 Povo, Trento, Italy
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.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 97 (109 Pages from: 100405-1 to: 100405-4
KeyWords: strongly interacting fermions; spin-correlation function; DOI: 10.1103/PhysRevLett.97.100405ImpactFactor: 7.072Citations: 30data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-24References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here
