Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.170402
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Funding
- ESF
- SCALA
- ANR FABIOLA
- Region Ile de France
- ERC
- Institut Universitaire de France
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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 quasiparticle 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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