Dynamic structure factor of a superfluid Fermi gas
Anno: 2001
Autori: Minguzzi A., Ferrari G., Castin Y.
Affiliazione autori: Istituto Nazionale di Fisica della Materia and Classe di Scienze, Scuola Normale Superiore, piazza dei Cavalieri 7, 56126 Pisa, Italy
Istituto Nazionale di Fisica della Materia and European Laboratory for Non-Linear Spectroscopy, Università di Firenze, Largo E. Fermi 2, 50125 Firenze, Italy
Laboratoire Kastler-Brossel, Ecole Normale Sup´rieure, 24 rue Lhomond, 75231 Paris, France
Abstract: We describe the excitation spectrum of a two-component neutral Fermi gas with attractive interactions in the superfluid phase at finite temperature by deriving a suitable Random-Phase approximation in the collisionless regime with the technique of functional derivatives. The obtained spectrum for the homogeneous gas at small wavevectors contains the Bogoliubov-Anderson phonon and is essentially different from the spectrum predicted by the static Bogoliubov theory, which instead shows an unphysically large response. We adapt the results for the homogeneous system to obtain the dynamic structure factor of a harmonically confined superfluid and we identify in the spectrum a unique feature of the superfluid phase.
Giornale/Rivista: EUROPEAN PHYSICAL JOURNAL D
Volume: 17 (1) Da Pagina: 49 A: 55
Parole chiavi: BCS superfluiditiy; Fermi gas; dynamic structure factorDOI: 10.1007/s100530170036Citazioni: 46dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-05-05Riferimenti 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