Expansion of a Fermi cloud in the BCS-BEC crossover
Anno: 2006
Autori: Diana G., Manini N., Salasnich L.
Affiliazione autori: Dipartimento di Fisica and CNR-INFM, Università di Milano, Via Celoria 16, 20133 Milano, Italy;
CNR-INFM and CNISM, Unità di Milano, Via Celoria 16, 20133 Milano, Italy
Abstract: We study the free expansion of a dilute two-component Fermi gas with attractive interspecies interaction in the Bardeen-Cooper-Schrieffer-Bose-Einstein condensate (BCS-BEC) crossover. We apply a time-dependent parameter-free density-functional theory by using two choices of the equation of state: an analytic formula based on Monte Carlo data and the mean-field equation of state resulting from the extended BCS equations. The calculated axial and transverse radii and the aspect ratio of the expanding cloud are compared to experimental data on vapors of Li-6 atoms. Remarkably, the mean-field theory shows a better agreement with the experiments than the theory based on the Monte Carlo equation of state. Both theories predict a measurable dependence of the aspect ratio on expansion time and on scattering length.
Giornale/Rivista: PHYSICAL REVIEW A
Volume: 73 (6) Da Pagina: 065601-1 A: 065601-5
Parole chiavi: ultracold atomsDOI: 10.1103/PhysRevA.73.065601Citazioni: 41dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-05-12Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui