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First and Second Sound Modes in a Uniform Fermi Gas |
| HUANG Bei-Bing, WAN Shao-Long |
| Institute for Theoretical Physics and Department of Modern Physics, University of Science and Technology of China, Hefei 230026 |
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HUANG Bei-Bing, WAN Shao-Long 2009 Chin. Phys. Lett. 26 070304 |
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Abstract First and second sound modes in a uniform fermionic atom gas with Feshbach resonance are investigated in the frame of a two-fluid model at finite temperature. All thermodynamic quantities are calculated for a given thermodynamic potential. The analytical results for thermodynamic quantities and sound velocities in BCS and BEC limits are obtained. The numerical results show that there exists a continuous interpolation for sound velocities of the first and second sound modes at fixed T/Tc between BCS and BEC limits. The existence of the second sound mode indicates the existence of superfluidity.
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| Keywords:
03.75.Kk
03.75.Ss
74.20.Mn
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Received: 05 February 2009
Published: 02 July 2009
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| PACS: |
03.75.Kk
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(Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)
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03.75.Ss
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(Degenerate Fermi gases)
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74.20.Mn
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(Nonconventional mechanisms)
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