Volume 116, Number 4, November 2016
|Number of page(s)||7|
|Published online||28 December 2016|
Landau-Khalatnikov phonon damping in strongly interacting Fermi gases
Laboratoire Kastler Brossel, ENS-PSL, CNRS, UPMC-Sorbonne Universités and Collège de France Paris, France
Received: 12 October 2016
Accepted: 2 December 2016
We derive the phonon damping rate due to the four-phonon Landau-Khalatnikov process in low-temperature strongly interacting Fermi gases using quantum hydrodynamics, correcting and extending the original calculation of Landau and Khalatnikov (Zh. Eksp. Teor. Fiz., 19 (1949) 637). Our predictions can be tested in state-of-the-art experiments with cold atomic gases in the collisionless regime.
PACS: 03.75.Kk – Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow / 67.85.Lm – Degenerate Fermi gases / 47.37.+q – Hydrodynamic aspects of superfluidity; quantum fluids
© EPLA, 2016
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