Universal contact and collective excitations of a strongly interacting Fermi gas

Year: 2011

Authors: Li Yun, Stringari S.

Autors Affiliation: Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; INO CNR BEC Ctr, I-38123 Povo, Italy.

Abstract: We study the relationship between Tan’s contact parameter and the macroscopic dynamic properties of an ultracold trapped gas, such as the frequencies of the collective oscillations and the propagation of sound in one-dimensional (1D) configurations. We find that the value of the contact, extracted from the most recent low-temperature measurements of the equation of state near unitarity, reproduces with accuracy the experimental values of the collective frequencies of the radial breathing mode at the lowest temperatures. The available experiment results for the 1D sound velocities near unitarity are also investigated.

Journal/Review: PHYSICAL REVIEW A

Volume: 84 (2)      Pages from: 23628-1  to: 23628-5

More Information: Useful discussions with R. Combescot and L. P. Pitaevskii are acknowledged. This work has been supported by ERC through the QGBE grant.
KeyWords: Bose-gas
DOI: 10.1103/PhysRevA.84.023628

Citations: 6
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