Atom-only theories for U(1) symmetric cavity-QED models
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.
Citation
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
Publication
Physical Review Research
Status
Peer reviewed
ISSN
2643-1564Type
Journal article
Description
Funding: R.P. was supported by the EPSRC Scottish Doctoral Training Centre in Condensed Matter Physics (CM-CDT), Grant No. EP/L015110/1.Collections
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