Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 26: Quantum Dynamics, Decoherence and Quantum Information (jointly with DY)
TT 26.13: Talk
Monday, March 16, 2015, 18:15–18:30, BH-N 334
Dynamics of the dissipative Dicke model: superradiance of cold atoms via a superconducting cavity — Sebastian Fuchs1,2, •Björn Kubala1, Miles Blencowe3, and Joachim Ankerhold1 — 1Insitute for Complex Quantum Systems, Ulm University, Ulm, Germany — 2Northwestern University, Evanston IL, USA — 3Dartmouth College, Hanover NH, USA
Superradiance is associated with two physical effects: Firstly, the cooperative emission of radiation of a large number of excited atoms into free space in a quick, strong ‘superradiant burst’. Secondly, for sufficiently strong coupling of many atoms to an electromagnetic cavity mode, modeled with the Dicke Hamiltonian, a ‘superradiant phase’ is found, which shows macroscopic photon occupation and atomic excitation.
The two facets of superradiance can be combined in studying the dissipative dynamics of an initially excited state of the atoms towards equilibrium. We identify and characterize the analogue of the free-space burst in this scenario, and discuss how signatures of normal or superradiant phase are observable for a mesoscopic number of atoms.