Low-temperature thermodynamics of the unitary Fermi gas: Superfluid fraction, first sound, and second sound
Anno: 2010
Autori: Salasnich L.
Affiliazione autori: CNR – Istituto Nazionale di Ottica and Dip. di fisica, Università di Padova Italy
Abstract: We investigate the low-temperature thermodynamics of the unitary Fermi gas by introducing a model based on the zero-temperature spectra of both bosonic collective modes and fermonic single-particle excitations. We calculate the Helmholtz free energy and from it we obtain the entropy, the internal energy, and the chemical potential as a function of the temperature. By using these quantities and the Landau\’s expression for the superfluid density we determine analytically the superfluid fraction, the critical temperature, the first sound velocity, and the second sound velocity. We compare our analytical results with other theoretical predictions and experimental data of ultracold atoms and dilute neutron matter.
Giornale/Rivista: PHYSICAL REVIEW A
Volume: 82 (6) Da Pagina: 063619 A: 063619
Parole chiavi: bcs-becDOI: 10.1103/PhysRevA.82.063619Citazioni: 22dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-28Riferimenti 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