Atom-only theories for U(1) symmetric cavity-QED models
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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.
Palacino , R & Keeling , J 2021 , ' Atom-only theories for U(1) symmetric cavity-QED models ' , Physical Review Research , vol. 3 , no. 3 , L032016 . https://doi.org/10.1103/PhysRevResearch.3.L032016
Physical Review Research
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.
DescriptionR.P. was supported by the EPSRC Scottish Doctoral Training Centre in Condensed Matter Physics (CM-CDT), Grant No. EP/L015110/1.
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