期刊
PHYSICAL REVIEW RESEARCH
卷 3, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.3.L032016
关键词
-
资金
- EPSRC Scottish Doctoral Training Centre in Condensed Matter Physics (CM-CDT) [EP/L015110/1]
The study examines a generalized Dicke model with U(1) symmetry, showing how effective theories must vary for models with continuous symmetry. It provides a template for developing effective theories of more complex models. The research highlights the importance of including higher-order corrections in describing the transition to a superradiant state in this model.
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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