期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.055303
关键词
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资金
- Austrian Science Fund (FWF) within SFB FoQuS [F4004-N16]
- European Research Council
- NSF
- AFOSR
- ONR
- ARO
- DARPA OLE program
- David and Lucile Packard Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0969311, 0959057] Funding Source: National Science Foundation
We provide a joint theoretical and experimental investigation of the temperature dependence of the collective oscillations of first sound nature exhibited by a highly elongated harmonically trapped Fermi gas at unitarity, including the region below the critical temperature for superfluidity. Differently from the lowest axial breathing mode, the hydrodynamic frequencies of the higher-nodal excitations show a temperature dependence, which is calculated starting from Landau two-fluid theory and using the available experimental knowledge of the equation of state. The experimental results agree with high accuracy with the predictions of theory and provide the first evidence for the temperature dependence of the collective frequencies near the superfluid phase transition. DOI: 10.1103/PhysRevLett.110.055303
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