Low-temperature thermodynamics of the unitary Fermi gas: Superfluid fraction, first sound, and second sound
Authors: Salasnich L.
Autors Affiliation: 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.
Journal/Review: PHYSICAL REVIEW A
Volume: 82 (6) Pages from: 063619 to: 063619
KeyWords: bcs-becDOI: 10.1103/PhysRevA.82.063619Citations: 20data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-02-23References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here