Scientific Results

Metastability in spin-polarized Fermi gases and quasiparticle decays

Year: 2011

Authors: Sadeghzadeh K., Bruun G., Lobo C., Massignan P., Recati A.

Autors Affiliation: Department of Physics, Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK; Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark; School of Mathematics, University of Southampton, Highfield, Southampton, SO17 1BJ, UK; Física Teorica: Informació i Processos Quàntics, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain; ICFO—Institut de Ciències Fotòniques—Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain; INO-CNR BEC Center and Dipartimento di Fisica, Universita di Trento, via Sommarive 14, I-38123 Povo, Italy

Abstract: The metastability associated with the first-order transition from the normal to the superfluid phase is investigated in the phase diagram of two-component polarized Fermi gases. We begin by detailing the dominant decay processes of single quasiparticles, determining the momentum thresholds of each process and calculating their rates. This understanding is then applied to a Fermi sea of polarons, and we predict a region of metastability for the normal partially polarized phase. We propose experiments to observe the threshold of the metastable region, the interaction strength at which the quasiparticle ground state changes character, and the decay rate of polarons.

Journal/Review: NEW JOURNAL OF PHYSICS

Volume: 13      Pages from: 055011  to: 055011

More Information: KS and CL acknowledge support from the EPSRC through Advanced Fellowship EP/E053033/1. PM acknowledges support from the ESF/MEC project FERMIX (FIS2007-29996-E), the Spanish MEC project FIS2008-01236 and the Catalan project 2009-SGR-985. AR acknowledges support from the ESF/MEC project FERMIX and the ERC through a QGBE grant (FIS2007-29996-E).
DOI: 10.1088/1367-2630/13/5/055011

Citations: 4
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English