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

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.

Quantum Gases (cond-mat.quant-gas); Atomic Physics (physics.atom-ph); Quantum Physics (quant-ph)

arXiv:2504.17731 [cond-mat.quant-gas]

(or arXiv:2504.17731v2 [cond-mat.quant-gas] for this version)

https://doi.org/10.48550/arXiv.2504.17731 Focus to learn more arXiv-issued DOI via DataCite

Phys. Rev. Lett. 136, 140401 (2026)

https://doi.org/10.1103/q36k-v3yh Focus to learn more DOI(s) linking to related resources

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