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Q: Fachverband Quantenoptik und Photonik

Q 63: Strong Light-Matter Interaction

Q 63.8: Vortrag

Freitag, 15. März 2024, 12:45–13:00, HS 3118

Semiclassical spin self-organization in non-equilibrium generalized Dicke models — •Marc Nairn¹, Simon Jäger², Giovanna Morigi³, Luigi Giannelli⁴, and Beatriz Olmos-Sanchez¹ — ¹Institut für Theoretische Physik, Universität Tübingen, 72076 Tübingen, Germany — ²Physics Department and Research Center OPTIMAS, University of Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — ³Theoretische Physik, Universität des Saarlandes, D-66123 Saarbrücken, Germany — ⁴Dipartimento di Fisica e Astronomia Ettore Majorana, Università di Catania, 95123 Catania, Italy

Cavity setups serve to probe all to all interactions in many-body spin systems and are intriguing platforms for quantum simulation of exotic states of matter. Motivated by recent experiments with BECs showing the self-organized phase in the non-equilibrium Dicke model, here we study a range of generalized Dicke models and establish the transition into an atomic self-organized state due to spin-motion correlations. We are able to faithfully replicate the dynamics of individual spins in a large atomic ensemble close to the semiclassical limit by taking advantage of the so called discrete Truncated Wigner Approximation (dTWA) and performing an extensive phase-space Monte Carlo sampling. We observe a transition to a spin self-ordered state when the coupling strength is increased beyond a critical value. At this point the atoms align themselves at the cavity field maxima and minima, resulting in an in-phase superradiant emission into the cavity mode. We show the system hosts a rich phase diagram, where the self-ordered state may be finely tuned by means of external lasers.

Keywords: semiclassical dynamics; self-organization; superradiant phase transition