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Article Dans Une Revue Physical Review Letters Année : 2009

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

Résumé

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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Dates et versions

hal-00404383 , version 1 (16-07-2009)

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Sylvain Nascimbene, Nir Navon, Kaijun Jiang, Leticia Tarruell, Martin Teichmann, et al.. Collective Oscillations of an Imbalanced Fermi Gas: Axial Compression Modes and Polaron Effective Mass. Physical Review Letters, 2009, 103 (18), pp.170402. ⟨hal-00404383⟩
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