Collective Modes in a Unitary Fermi Gas across the Superfluid Phase Transition
Author(s)Tey, Meng Khoon; Sidorenkov, Leonid A.; Sanchez Guajardo, Edmundo R.; Grimm, Rudolf; Zwierlein, Martin Wolfram; Hou, Yan-Hua; Pitaevskii, Lev; Stringarii, Sandro; Ku, Mark J. H.; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics; MIT-Harvard Center for Ultracold Atoms
Physical Review Letters
American Physical Society
Tey, Meng Khoon, Leonid A. Sidorenkov, Edmundo R. Sánchez Guajardo, et al. "Collective Modes in a Unitary Fermi Gas Across the Superfluid Phase Transition." Physical Review Letters 110, 055303 (2013) [5 pages]. © 2013 American Physical Society. Web.
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