Pair correlations of an expanding superfluid fermi gas

Anno: 2006

Autori: Lobo C., Carusotto I., Giorgini S., Recati A., Stringari S.

Affiliazione autori: 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.

Giornale/Rivista: PHYSICAL REVIEW LETTERS

Volume: 97 (109      Da Pagina: 100405-1  A: 100405-4

Parole chiavi: strongly interacting fermions; spin-correlation function;
DOI: 10.1103/PhysRevLett.97.100405

Citazioni: 30
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-11-03
Riferimenti tratti da Isi Web of Knowledge: (solo abbonati)
Link per visualizzare la scheda su IsiWeb: Clicca qui
Link per visualizzare la citazioni su IsiWeb: Clicca qui