Collective modes of an imbalanced unitary Fermi gas
Collective modes of an imbalanced unitary Fermi gas
We study theoretically the collective mode spectrum of a strongly imbalanced two-component unitary Fermi gas in a cigar-shaped trap, where the minority species forms a gas of polarons. We describe the collective breathing mode of the gas in terms of the Fermi liquid kinetic equation taking collisions into account using the method of moments. Our results for the frequency and damping of the longitudinal in-phase breathing mode are in good quantitative agreement with an experiment by S. Nascimb`ene et al. [Phys. Rev. Lett. 103, 170402 (2009)] and interpolate between a hydrodynamic and a collisionless regime as the polarization is increased. A separate out-of phase breathing mode, which for a collisionless gas is sensitive to the effective mass of the polaron, however, is strongly damped at finite temperature, whereas the experiment observes a well-defined oscillation.
Hofmann, Johannes
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Chevy, Frederic
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Goulko, Olga
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Lobo, Carlos
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Hofmann, Johannes
9fd23af5-debe-4bb3-bf0d-8db0dcdb313f
Chevy, Frederic
41e3707b-036d-42a5-83c4-8e38ca5afe22
Goulko, Olga
b0377d84-400e-4b43-abd7-5172e385359e
Lobo, Carlos
cde7843a-c00b-4242-a8cd-1abb2dfe0703
Hofmann, Johannes, Chevy, Frederic, Goulko, Olga and Lobo, Carlos
(2018)
Collective modes of an imbalanced unitary Fermi gas.
Physical Review A, 97, [033613].
(doi:10.1103/PhysRevA.97.033613).
Abstract
We study theoretically the collective mode spectrum of a strongly imbalanced two-component unitary Fermi gas in a cigar-shaped trap, where the minority species forms a gas of polarons. We describe the collective breathing mode of the gas in terms of the Fermi liquid kinetic equation taking collisions into account using the method of moments. Our results for the frequency and damping of the longitudinal in-phase breathing mode are in good quantitative agreement with an experiment by S. Nascimb`ene et al. [Phys. Rev. Lett. 103, 170402 (2009)] and interpolate between a hydrodynamic and a collisionless regime as the polarization is increased. A separate out-of phase breathing mode, which for a collisionless gas is sensitive to the effective mass of the polaron, however, is strongly damped at finite temperature, whereas the experiment observes a well-defined oscillation.
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main_polaron_v5
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Accepted/In Press date: 27 February 2018
e-pub ahead of print date: 21 March 2018
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Local EPrints ID: 418431
URI: http://eprints.soton.ac.uk/id/eprint/418431
PURE UUID: 9c2604ed-1c1f-4520-a3cb-df20116cd08f
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Date deposited: 08 Mar 2018 17:30
Last modified: 16 Mar 2024 06:17
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Author:
Johannes Hofmann
Author:
Frederic Chevy
Author:
Olga Goulko
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