Atom-only theories for U(1) symmetric cavity-QED models

Roberta Palacino; Jonathan Keeling

doi:10.1103/PhysRevResearch.3.L032016

Atom-only theories for U(1) symmetric cavity-QED models

Roberta Palacino, Jonathan Keeling

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12 Citations (Scopus)

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Abstract

We consider a generalized Dicke model with U(1) symmetry, which can undergo a transition to a superradiant state that spontaneously breaks this symmetry. By exploiting the difference in timescale between atomic and cavity dynamics, one may eliminate the cavity dynamics, providing an atom-only theory. We show that the standard Redfield theory cannot describe the transition to the superradiant state, but including higher-order corrections does recover the transition. Our work reveals how the forms of effective theories must vary for models with continuous symmetry, and provides a template to develop effective theories of more complex models.

Original language	English
Article number	L032016
Number of pages	6
Journal	Physical Review Research
Volume	3
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevResearch.3.L032016
Publication status	Published - 19 Jul 2021

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10.1103/PhysRevResearch.3.L032016Licence: CC BY

Palacino_2021_PRR_Atom-only_CC
Copyright © 2021 The Authors. Open Access. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Final published version, 429 KBLicence: CC BY

CM-DTC EVENTS: EPSRC centre for doctoral training in condensed matter physics
King, P. (PI)
EPSRC
1/08/14 → 31/01/24
Project: Standard
CM DTC 2014 - 2022: EPSRC centre for doctoral training in condensed matter physics: Renewal of the CM-DTC
King, P. (PI)
EPSRC
1/08/14 → 31/01/24
Project: Standard

Data Underpinning: Atom-only theories for U(1) symmetric cavity-QED models
Palacino, R. (Creator) & Keeling, J. M. J. (Creator), University of St Andrews, 22 Jul 2021
DOI: 10.17630/c780e316-128c-4f2c-84d0-f7ee7876938d
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N2 - We consider a generalized Dicke model with U(1) symmetry, which can undergo a transition to a superradiant state that spontaneously breaks this symmetry. By exploiting the difference in timescale between atomic and cavity dynamics, one may eliminate the cavity dynamics, providing an atom-only theory. We show that the standard Redfield theory cannot describe the transition to the superradiant state, but including higher-order corrections does recover the transition. Our work reveals how the forms of effective theories must vary for models with continuous symmetry, and provides a template to develop effective theories of more complex models.

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Atom-only theories for U(1) symmetric cavity-QED models

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CM-DTC EVENTS: EPSRC centre for doctoral training in condensed matter physics

CM DTC 2014 - 2022: EPSRC centre for doctoral training in condensed matter physics: Renewal of the CM-DTC

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Data Underpinning: Atom-only theories for U(1) symmetric cavity-QED models

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