Work

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

Year: 2009

Type: article

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 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.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.103.170402

Authors: S. Nascimbène, N. Navon, K. J. Jiang, L. Tarruell, M. Teichmann, J. McKeever, F. Chevy, C. Salomon

Institutions: Centre National de la Recherche Scientifique, Laboratoire Kastler Brossel, École Normale Supérieure - PSL, Université Pierre-et-Marie-Curie

Language: English

Topic: Cold Atom Physics and Bose-Einstein Condensates

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Agence Nationale de la Recherche, Institut Universitaire de France, Institut Francilien de Recherche sur les Atomes Froids, European Social Fund

OpenAlex ID: W2073903977

FWCI: 16.29

Cites: 31

Cited by: 335

Related to: 10