Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-04-15
Phys. Rev. A 76, 051602(R) (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures, replaced with revised version
Scientific paper
10.1103/PhysRevA.76.051602
We determine the temperature $T$ dependence of first and second sound mode frequencies for trapped Fermi gases undergoing BCS to Bose Einstein condensation (BEC) crossover. Our results are based on the two fluid equations in conjunction with a microscopic calculation of thermodynamical variables. As in experiment and at unitarity, we show that the lowest radial breathing mode is $T$ independent. At finite $T$, higher order breathing modes strongly mix with second sound. Their complex $T$ dependence should provide an alternative way of measuring the transition temperature, $T_c$.
Chen Qijin
Chien Chih-Chun
He Yan
Levin Kathryn
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