Decay of Polarons and Molecules in a Strongly Polarized Fermi Gas
(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:
https://lup.lub.lu.se/record/1657752
- author
- Bruun, Georg LU and Massignan, P.
- organization
- publishing date
- 2010
- 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}}, }