Document Detail

Controlling Discrete and Continuous Symmetries in "Superradiant" Phase Transitions with Circuit QED Systems.
MedLine Citation:
PMID:  24836245     Owner:  NLM     Status:  In-Data-Review    
We explore theoretically the physics of a collection of two-level systems coupled to a single-mode bosonic field in the nonstandard configuration where each (artificial) atom is coupled to both field quadratures of the boson mode. We show that such an unusual coupling scheme can be implemented in circuit QED systems, where artificial Josephson atoms are coupled both capacitively and inductively to a superconducting resonator. We demonstrate that it is possible to pass from a discrete, paritylike Z_{2} symmetry to a continuous U(1) with the appearance of photonic Goldstone and amplitude modes above a critical point even in the ultrastrong coupling regime (where the rotating wave approximation for the interaction between field and two-level systems is no longer applicable). We determine the rich phase diagram showing "superradiant" phases with different symmetries and phase boundaries of both first and second order.
Alexandre Baksic; Cristiano Ciuti
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Publication Detail:
Type:  Journal Article     Date:  2014-04-29
Journal Detail:
Title:  Physical review letters     Volume:  112     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2014 May 
Date Detail:
Created Date:  2014-05-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  173601     Citation Subset:  IM    
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