Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 63: Strong Light-Matter Interaction

Q 63.2: Vortrag

Freitag, 15. März 2024, 11:15–11:30, HS 3118

Dissipative Dicke time crystals: an atoms' point of view — •Simon B. Jäger, Jan Mathis Giesen, Imke Schneider, and Sebastian Eggert — Physics Department and Research Center OPTIMAS, University of Kaiserslautern-Landau

We develop and study an atom-only description of the Dicke model with time-periodic couplings between atoms and a dissipative cavity mode. The cavity mode is eliminated giving rise to effective atom-atom interactions and dissipation. We use this effective description to analyze the dynamics of the atoms that undergo a transition to a dynamical superradiant phase with macroscopic coherences in the atomic medium and the light field. Using Floquet theory in combination with the atom-only description we provide a precise determination of the phase boundaries and of the dynamical response of the atoms. From this we can predict the existence of dissipative time crystals that show a subharmonic response with respect to the driving frequency. We show that the atom-only theory can describe the relaxation into such a dissipative time crystal and that the damping rate can be understood in terms of a cooling mechanism.

Keywords: Time crystals; Open quantum systems; Dicke model