Collective Modes in a Unitary Fermi Gas across the Superfluid Phase Transition
Abstract
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.
Keywords
Cite
@article{arxiv.1211.2659,
title = {Collective Modes in a Unitary Fermi Gas across the Superfluid Phase Transition},
author = {Meng Khoon Tey and Leonid A. Sidorenkov and Edmundo R. Sánchez Guajardo and Rudolf Grimm and Mark J. H. Ku and Martin W. Zwierlein and Yan-Hua Hou and Lev Pitaevskii and Sandro Stringari},
journal= {arXiv preprint arXiv:1211.2659},
year = {2013}
}
Comments
5 pages, 2 figures