Wang X, Li X, Arakelyan I, Thomas JE. Hydrodynamic Relaxation in a Strongly Interacting Fermi Gas.
PHYSICAL REVIEW LETTERS 2022;
128:090402. [PMID:
35302786 DOI:
10.1103/physrevlett.128.090402]
[Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 01/13/2022] [Accepted: 02/08/2022] [Indexed: 06/14/2023]
Abstract
We measure the free decay of a spatially periodic density profile in a normal fluid strongly interacting Fermi gas, which is confined in a box potential. This spatial profile is initially created in thermal equilibrium by a perturbing potential. After the perturbation is abruptly extinguished, the dominant spatial Fourier component exhibits an exponentially decaying (thermally diffusive) mode and a decaying oscillatory (first sound) mode, enabling independent measurement of the thermal conductivity and the shear viscosity directly from the time-dependent evolution.
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