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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.
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
105
issue
2
publisher
American Physical Society
external identifiers
  • wos:000279650700001
  • scopus:77954400604
ISSN
1079-7114
DOI
10.1103/PhysRevLett.105.020403
language
English
LU publication?
yes
id
2e6d43d1-89b5-4f62-9c64-135dc3d34ac5 (old id 1657752)
date added to LUP
2010-08-24 11:39:28
date last changed
2018-05-29 09:44:04
@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.},
  articleno    = {020403},
  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},
  volume       = {105},
  year         = {2010},
}