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
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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
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 209571
- DOI 10.1103/PhysRevA.88.053801
- Persistent URL
- https://folia.unifr.ch/unifr/documents/303615
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