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Article
Collective Modes of an Imbalanced Unitary Fermi Gas
Physical Review A
(2018)
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 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.
Disciplines
Publication Date
March, 2018
DOI
10.1103/PhysRevA.97.033613
Citation Information
Johannes Hofmann, Frederic Chevy, Olga Goulko and Carlos Lobo. "Collective Modes of an Imbalanced Unitary Fermi Gas" Physical Review A Vol. 97 Iss. 3 (2018) p. 033613 Available at: http://works.bepress.com/olga-goulko/8/