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Collective Oscillations of an Imbalanced Fermi Gas: Axial Compression Modes and Polaron Effective Mass

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arxiv 0907.3032 v1 pith:DGSQJSXK submitted 2009-07-17 cond-mat.other

Sylvain Nascimbene (LKB - Lhomond) , Nir Navon (LKB - Lhomond) , Kaijun Jiang (LKB - Lhomond) , Leticia Tarruell (ETH) , Martin Teichmann (Max-Born-Institut) , Jason Mckeever (IOS) , Frédéric Chevy (LKB - Lhomond) , Christophe Salomon (LKB - Lhomond) This is my paper · ORCID
classification cond-mat.other
keywords fermispincomponentscompressioneffectiveimbalancedmassmodes
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abstract

We investigate the low-lying compression modes of a unitary Fermi gas with imbalanced spin populations. For low polarization, the strong coupling between the two spin components leads to a hydrodynamic behavior of the cloud. For large population imbalance we observe a decoupling of the oscillations of the two spin components, giving access to the effective mass of the Fermi polaron, a quasi-particle composed of an impurity dressed by particle-hole pair excitations in a surrounding Fermi sea. We find $m^*/m=1.17(10)$, in agreement with the most recent theoretical predictions.

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  1. Rabi Oscillations of Strongly Driven Bose Polarons

    cond-mat.quant-gas 2025-04 conditional novelty 6.0 of 10

    A trial-wavefunction calculation predicts anomalous Rabi oscillations and a steady-state magnetization for strongly driven Bose polarons when attractive and repulsive polaron branches coexist.

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