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

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

2009-07-17

arxiv.org/abs/0907.3032v1

Physical Review Letters 103, 18 (2009) 170402

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures, submitted to PRL

Scientific paper

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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