Landau-Khalatnikov phonon damping in strongly interacting Fermi gases

H Kurkjian (1) , Yvan Castin (1) , A Sinatra (1)

1 LKB (Lhomond) - Laboratoire Kastler Brossel

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 [ZhETF 19, 637 (1949)]. Our predictions can be tested in state-of-the-art experiments with cold atomic gases in the collisionless regime.

Mots clés: Fermi gases; phonon damping; quantum hydrodynamics; quantum gases; superfluidity; strong interactions; ultracold atoms

Domaines: Gaz Quantiques [cond-mat.quant-gas]

H Kurkjian, Yvan Castin, A Sinatra. Landau-Khalatnikov phonon damping in strongly interacting Fermi gases. 2016. ⟨hal-01350507v1⟩