Decay of polarons and molecules in a strongly polarized Fermi gas

Details Decay of polarons and molecules in a strongly polarized Fermi gas Decay of polarons and molecules in a strongly polarized Fermi gas

2010-03-29

arxiv.org/abs/1003.5667v2

Phys. Rev. Lett. 105, 020403 (2010)

Physics

Condensed Matter

Quantum Gases

Version accepted in PRL. Added discussion of three-body losses to deeply bound molecular states

Scientific paper

10.1103/PhysRevLett.105.020403

The ground state of an impurity immersed in a Fermi sea changes from a polaron to a molecule as the interaction strength is increased. We show here that the coupling between these two states is strongly suppressed due to a combination of phase space effects and Fermi statistics, and that it vanishes much faster than the energy difference between the two states, thereby confirming the first order nature of the polaron-molecule transition. In the regime where each state is metastable, we find quasiparticle lifetimes which are much longer than what is expected for a usual Fermi liquid. Our analysis indicates that the decay rates are sufficiently slow to be experimentally observable.

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