Universität zu Köln

Gelhausen, Jan ORCID: 0000-0003-0705-8566, Buchhold, Michael ORCID: 0000-0001-5194-9388 and Strack, Philipp (2017). Many-body quantum optics with decaying atomic spin states: (gamma, kappa) Dicke model. Phys. Rev. A, 95 (6). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9934

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Abstract

We provide a theory for quantum-optical realizations of the open Dicke model with internal, atomic spin states subject to spontaneous emission with rate gamma. This introduces a second decay channel for excitations to irreversibly dissipate into the environment, in addition to the photon loss with rate., which is composed of individual atomic decay processes and a collective atomic decay mechanism. The strength of the latter is determined by the cavity geometry. We compute the mean-field nonequilibrium steady states for spin and photon observables in the long-time limit, t -> infinity. Although gamma does not conserve the total angular momentum of the spin array, we argue that our solution is exact in the thermodynamic limit for the number of atoms N -> infinity. In light of recent and upcoming experiments realizing superradiant phase transitions using internal atomic states with pinned atoms in optical lattices, our work lays the foundation for the pursuit of a new class of open quantum magnets coupled to quantum light.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gelhausen, Jan UNSPECIFIED orcid.org/0000-0003-0705-8566 UNSPECIFIED Buchhold, Michael UNSPECIFIED orcid.org/0000-0001-5194-9388 UNSPECIFIED Strack, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-227588
DOI:	10.1103/PhysRevA.95.063824
Journal or Publication Title:	Phys. Rev. A
Volume:	95
Number:	6
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9934
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Theoretical Physics
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PHASE-TRANSITION; CAVITY; LATTICE; LIGHT Multiple languages Optics; Physics, Atomic, Molecular & Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22758