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

2009/07/17 by Sylvain Nascimbene, Nir Navon, Kaijun Jiang +5 · 2 citations
Physics and Astronomy · #cond-mat.other

paper · pdf · doi:10.1103/physrevlett.103.170402

published as Physical Review Letters 103, 18 (2009) 170402 · 4 pages, 4 figures, submitted to PRL

arxiv created 2009/07/17 · arxiv updated 2015/05/13

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.

Cited by

• Quantum Impurities as Probes of Finite-Temperature Fluctuations in Two-Dimensional Bose Gases
• Rabi Oscillations of Strongly Driven Bose Polarons

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