Dynamically generated reduction of the mean photon number in the Dicke model

Tomka, Michael; Baeriswyl, Dionys; Gritsev, Vladimir

doi:10.1103/PhysRevA.88.053801

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Journal article

Dynamically generated reduction of the mean photon number in the Dicke model

Tomka, Michael Physics Department, University of Fribourg, Switzerland
Baeriswyl, Dionys Physics Department, University of Fribourg, Switzerland
Gritsev, Vladimir Physics Department, University of Fribourg, Switzerland - Institute for Theoretical Physics, University of Amsterdam, The Netherlands

01.11.2013

Published in:

Physical Review A. - 2014, vol. 88, no. 5, p. 053801

English We study the dynamics of a driven Dicke model, where the collective spin is rotated with a constant velocity around a fixed axis. The time evolution of the mean photon number and of the atomic inversion is calculated using, on the one hand, a numerical technique for the quantum dynamics of a small number of two-level atoms and, on the other hand, time-dependent mean-field theory for the limit of a large number of atoms. We observe a reduction in the mean photon number compared to its equilibrium value. This dynamically generated darkness is particularly pronounced slightly above the transition to a superradiant phase. We attribute the effect to a slowing-down of the motion in the classical limit of a large ensemble and to an interplay of dynamic and geometric phases in the quantum case.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language