http://www.cnr.it/ontology/cnr/individuo/prodotto/ID58171
Low-temperature thermodynamics of the unitary Fermi gas: Superfluid fraction, first sound, and second sound (Articolo in rivista)
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- Label
- Low-temperature thermodynamics of the unitary Fermi gas: Superfluid fraction, first sound, and second sound (Articolo in rivista) (literal)
- Anno
- 2010-01-01T00:00:00+01:00 (literal)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- CNR - Istituto Nazionale di Ottica and Dip. di fisica, Università di Padova Italy (literal)
- Titolo
- Low-temperature thermodynamics of the unitary Fermi gas: Superfluid fraction, first sound, and second sound (literal)
- 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 Landaus 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. (literal)
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