Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 61: Posters - Quantum Systems

DY 61.6: Poster

Donnerstag, 23. März 2017, 17:00–19:30, P1A

Driven, dissipative dynamics of a Dicke model: relaxation and pumping — •Christos Bokas, Björn Kubala, and Joachim Ankerhold — Institute for Complex Quantum Systems and IQST, Ulm University, Ulm, Germany

A dissipative Dicke model can be realized in a new hybrid architecture, where a cloud of cold atoms is brought close to a superconducting microwave resonator. We establish a description of this hybrid in the quasi-continuum limit of a large number of atoms by deriving a mapping on single-particle motion in a single effective two-dimensional potential, so that the full coherent dynamics far from equilibrium can be investigated. Dissipative dynamics is then incorporated by the quantum jump method.

Within this framework, numerical simulations are feasible even for thousands of atoms in various non-equilibrium scenarios of interest. Exemplary, we study, how the system starting from a highly excited atomic cloud relaxes to equilibrium through a ``superradiant burst''. Via a time-dependent coupling between atoms and cavity, the system is pumped through the phase transition between normal and superradiant state.