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arXiv · 2504.17731

Synchronization of Quasi-Particle Excitations in a Quantum Gas with Cavity-Mediated Interactions

Gabriele Natale·Alexander Baumgärtner·Justyna Stefaniak·David Baur·Simon Hertlein·Dalila Rivero·Tilman Esslinger·Tobias Donner
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Abstract

Driven-dissipative quantum systems can undergo transitions from stationary to dynamical phases, reflecting the emergence of collective non-equilibrium behavior. We study such a transition in a Bose-Einstein condensate coupled to an optical cavity and develop a cavity-assisted Bragg spectroscopy technique to resolve its collective modes. We observe dissipation-induced synchronization at the quasiparticle level, where two roton-like modes coalesce at an exceptional point. This reveals how dissipation microscopically drives collective dynamics and signals a precursor to a dynamical phase transition.

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Gabriele Natale, Alexander Baumgärtner, Justyna Stefaniak, David Baur, Simon Hertlein, Dalila Rivero, Tilman Esslinger, Tobias Donner. 2025-04-24. Synchronization of Quasi-Particle Excitations in a Quantum Gas with Cavity-Mediated Interactions. https://doi.org/10.1103/q36k-v3yh

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