Decay of Polarons and Molecules in a Strongly Polarized Fermi Gas

Georg Bruun, P. Massignan

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Sammanfattning

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.
Originalspråkengelska
Artikelnummer020403
TidskriftPhysical Review Letters
Volym105
Nummer2
DOI
StatusPublished - 2010

Bibliografisk information

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Mathematical Physics (Faculty of Technology) (011040002)

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