Synchronization of Quasi-Particle Excitations in a Quantum Gas with Cavity-Mediated Interactions
arXiv:2504.17731 · doi:10.1103/q36k-v3yh
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.
11 pages, 5 figures
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