Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-12-02
New J. Phys. 13 (2011) 055011
Physics
Condensed Matter
Quantum Gases
12 pages, 5 figures
Scientific paper
10.1088/1367-2630/13/5/055011
We investigate the metastability associated with the first order transition from normal to superfluid phases in the phase diagram of two-component polarised Fermi gases.We begin by detailing the dominant decay processes of single quasiparticles.Having determined the momentum thresholds of each process and calculated their rates, we apply this understanding to a Fermi sea of polarons by linking its metastability to the stability of individual polarons, and predicting a region of metastability for the normal partially polarised phase. In the limit of a single impurity, this region extends from the interaction strength at which a polarised phase of molecules becomes the groundstate, to the one at which the single quasiparticle groundstate changes character from polaronic to molecular. Our argument in terms of a Fermi sea of polarons naturally suggests their use as an experimental probe. We propose experiments to observe the threshold of the predicted region of metastability, the interaction strength at which the quasiparticle groundstate changes character, and the decay rate of polarons.
Bruun Georg
Lobo Carlos
Massignan Pietro
Recati Alessio
Sadeghzadeh Kayvan
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