Clock shifts in a Fermi gas interacting with a minority component: A soluble model
(2010) In Physical Review A (Atomic, Molecular and Optical Physics) 81(3).- Abstract
- We consider the absorption spectrum of a Fermi gas mixed with a minority species when majority fermions are transferred to another internal state by an external probe. In the limit when the minority species is much more massive than the majority one, we show that the minority species may be treated as static impurities and the problem can be solved in closed form. The analytical results bring out the importance of vertex corrections, which change qualitatively the nature of the absorption spectrum. It is demonstrated that large line shifts are not associated with resonant interactions in general. We also show that the commonly used ladder approximation fails when the majority component is degenerate for large mass ratios between the... (More)
- We consider the absorption spectrum of a Fermi gas mixed with a minority species when majority fermions are transferred to another internal state by an external probe. In the limit when the minority species is much more massive than the majority one, we show that the minority species may be treated as static impurities and the problem can be solved in closed form. The analytical results bring out the importance of vertex corrections, which change qualitatively the nature of the absorption spectrum. It is demonstrated that large line shifts are not associated with resonant interactions in general. We also show that the commonly used ladder approximation fails when the majority component is degenerate for large mass ratios between the minority and majority species and that bubble diagrams, which correspond to the creation of many particle-hole pairs, must be taken into account. We carry out detailed numerical calculations, which confirm the analytical insights, and we point out the connection to shadowing phenomena in nuclear physics. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1586926
- author
- Bruun, Georg LU ; Pethick, C. J. and Yu, Zhenhua
- organization
- publishing date
- 2010
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review A (Atomic, Molecular and Optical Physics)
- volume
- 81
- issue
- 3
- article number
- 033621
- publisher
- American Physical Society
- external identifiers
-
- wos:000276262500170
- scopus:77949760379
- ISSN
- 1050-2947
- DOI
- 10.1103/PhysRevA.81.033621
- 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
- c7ca3d2a-c007-40a5-a6d0-2010ed6139eb (old id 1586926)
- date added to LUP
- 2016-04-01 10:40:38
- date last changed
- 2022-01-26 01:24:38
@article{c7ca3d2a-c007-40a5-a6d0-2010ed6139eb,
abstract = {{We consider the absorption spectrum of a Fermi gas mixed with a minority species when majority fermions are transferred to another internal state by an external probe. In the limit when the minority species is much more massive than the majority one, we show that the minority species may be treated as static impurities and the problem can be solved in closed form. The analytical results bring out the importance of vertex corrections, which change qualitatively the nature of the absorption spectrum. It is demonstrated that large line shifts are not associated with resonant interactions in general. We also show that the commonly used ladder approximation fails when the majority component is degenerate for large mass ratios between the minority and majority species and that bubble diagrams, which correspond to the creation of many particle-hole pairs, must be taken into account. We carry out detailed numerical calculations, which confirm the analytical insights, and we point out the connection to shadowing phenomena in nuclear physics.}},
author = {{Bruun, Georg and Pethick, C. J. and Yu, Zhenhua}},
issn = {{1050-2947}},
language = {{eng}},
number = {{3}},
publisher = {{American Physical Society}},
series = {{Physical Review A (Atomic, Molecular and Optical Physics)}},
title = {{Clock shifts in a Fermi gas interacting with a minority component: A soluble model}},
url = {{http://dx.doi.org/10.1103/PhysRevA.81.033621}},
doi = {{10.1103/PhysRevA.81.033621}},
volume = {{81}},
year = {{2010}},
}