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Excitonic states of an impurity in a Fermi gas

Excitonic states of an impurity in a Fermi gas
Excitonic states of an impurity in a Fermi gas
We study excitonic states of an atomic impurity in a Fermi gas, i.e., bound states consisting of the impurity and a hole. Previous studies considered bound states of the impurity with particles from the Fermi sea where the holes formed only part of the particle-hole dressing. Within a two-channel model, we find that, for a wide range of parameters, excitonic states are not ground but metastable states. We further calculate the decay rates of the excitonic states to polaronic and dimeronic states and find they are long-lived, scaling as ?ExcPol?(??)5.5 and ?ExcDim?(??)4. We also find that a new continuum of exciton-particle states should be considered alongside the previously known dimeron-hole continuum in spectroscopic measurements. Excitons must therefore be considered a new ingredient in the study of metastable physics currently being explored experimentally
1050-2947
53605/1 to 53605/6
Lan, Zhihao
8ac95e5c-9f19-4e2c-b8fc-fe4e412ff8b7
Lobo, Carlos
cde7843a-c00b-4242-a8cd-1abb2dfe0703
Lan, Zhihao
8ac95e5c-9f19-4e2c-b8fc-fe4e412ff8b7
Lobo, Carlos
cde7843a-c00b-4242-a8cd-1abb2dfe0703

Lan, Zhihao and Lobo, Carlos (2015) Excitonic states of an impurity in a Fermi gas. Physical Review A, 92, 53605/1 to 53605/6, [53605]. (doi:10.1103/PhysRevA.92.053605).

Record type: Article

Abstract

We study excitonic states of an atomic impurity in a Fermi gas, i.e., bound states consisting of the impurity and a hole. Previous studies considered bound states of the impurity with particles from the Fermi sea where the holes formed only part of the particle-hole dressing. Within a two-channel model, we find that, for a wide range of parameters, excitonic states are not ground but metastable states. We further calculate the decay rates of the excitonic states to polaronic and dimeronic states and find they are long-lived, scaling as ?ExcPol?(??)5.5 and ?ExcDim?(??)4. We also find that a new continuum of exciton-particle states should be considered alongside the previously known dimeron-hole continuum in spectroscopic measurements. Excitons must therefore be considered a new ingredient in the study of metastable physics currently being explored experimentally

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More information

e-pub ahead of print date: 5 November 2015
Published date: 5 November 2015
Organisations: Applied Mathematics

Identifiers

Local EPrints ID: 383661
URI: http://eprints.soton.ac.uk/id/eprint/383661
ISSN: 1050-2947
PURE UUID: 296c72be-c474-41b6-9323-fd5dc35e1983
ORCID for Carlos Lobo: ORCID iD orcid.org/0000-0001-7060-3905

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Date deposited: 20 Nov 2015 11:50
Last modified: 15 Mar 2024 03:32

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Contributors

Author: Zhihao Lan
Author: Carlos Lobo ORCID iD

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