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dc.contributor.authorPalacino, Roberta
dc.contributor.authorKeeling, Jonathan
dc.identifier.citationPalacino , R & Keeling , J 2021 , ' Atom-only theories for U(1) symmetric cavity-QED models ' , Physical Review Research , vol. 3 , no. 3 , L032016 .
dc.identifier.otherPURE: 274866791
dc.identifier.otherPURE UUID: 08494915-2085-4380-8ca9-d5b634d73ed9
dc.identifier.otherORCID: /0000-0002-4283-552X/work/97473518
dc.identifier.otherWOS: 000674634400007
dc.identifier.otherScopus: 85113832244
dc.descriptionR.P. was supported by the EPSRC Scottish Doctoral Training Centre in Condensed Matter Physics (CM-CDT), Grant No. EP/L015110/1.en
dc.description.abstractWe 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.
dc.relation.ispartofPhysical Review Researchen
dc.rightsCopyright © 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.en
dc.subjectQC Physicsen
dc.titleAtom-only theories for U(1) symmetric cavity-QED modelsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Centre for Designer Quantum Materialsen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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