Sound modes at the BCS-BEC crossover
- 10 January 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 73 (1), 013607
- https://doi.org/10.1103/physreva.73.013607
Abstract
First and second sound speeds are calculated for a uniform superfluid gas of Fermi atoms as a function of temperature, density, and interaction strength. The second sound speed is of particular interest as it is a clear signal of a superfluid component and it determines the critical temperature. The sound modes and their dependence on density, scattering length, and temperature are calculated in the BCS, molecular Bose-Einstein condensate (BEC), and unitarity limits and a smooth crossover is extrapolated. It is found that first and second sounds undergo avoided crossing on the BEC side due to mixing. Consequently, they are detectable at crossover both as density and thermal waves in traps.Keywords
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This publication has 45 references indexed in Scilit:
- Evidence for Superfluidity in a Resonantly Interacting Fermi GasPhysical Review Letters, 2004
- Crossover from a Molecular Bose-Einstein Condensate to a Degenerate Fermi GasPhysical Review Letters, 2004
- Observation of Resonance Condensation of Fermionic Atom PairsPhysical Review Letters, 2004
- Observation of Bose-Einstein Condensation of MoleculesPhysical Review Letters, 2003
- Pure Gas of Optically Trapped Molecules Created from Fermionic AtomsPhysical Review Letters, 2003
- Emergence of a molecular Bose–Einstein condensate from a Fermi gasNature, 2003
- Measurement of the Interaction Energy near a Feshbach Resonance in aFermi GasPhysical Review Letters, 2003
- Mechanical stability of a strongly interacting Fermi gas of atomsPhysical Review A, 2003
- Radio-Frequency Spectroscopy of Ultracold FermionsScience, 2003
- Observation of a Strongly Interacting Degenerate Fermi Gas of AtomsScience, 2002