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Decay of Polarons and Molecules in a Strongly Polarized Fermi Gas

Bruun, Georg LU and Massignan, P. (2010) In Physical Review Letters 105(2).
Abstract
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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author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
105
issue
2
article number
020403
publisher
American Physical Society
external identifiers
  • wos:000279650700001
  • scopus:77954400604
  • pmid:20867688
ISSN
1079-7114
DOI
10.1103/PhysRevLett.105.020403
language
English
LU publication?
yes
additional info
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)
id
2e6d43d1-89b5-4f62-9c64-135dc3d34ac5 (old id 1657752)
date added to LUP
2016-04-01 11:14:55
date last changed
2022-02-18 01:11:53
@article{2e6d43d1-89b5-4f62-9c64-135dc3d34ac5,
  abstract     = {{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.}},
  author       = {{Bruun, Georg and Massignan, P.}},
  issn         = {{1079-7114}},
  language     = {{eng}},
  number       = {{2}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Decay of Polarons and Molecules in a Strongly Polarized Fermi Gas}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.105.020403}},
  doi          = {{10.1103/PhysRevLett.105.020403}},
  volume       = {{105}},
  year         = {{2010}},
}