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

Physical Review Letters 2026 Open access

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Authors: Gabriele Natale, Alexander Baumgärtner, Justyna Stefaniak, D. Baur, Simon Hertlein, D. Rivero, Tilman Esslinger, Tobias Donner
DOI: 10.1103/q36k-v3yh
Cited by: 0
References: 33

Abstract

Driven-dissipative quantum systems can undergo transitions from stationary to dynamical phases, reflecting the emergence of collective nonequilibrium 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 rotonlike modes coalesce at an exceptional point. This reveals how dissipation microscopically drives collective dynamics and signals a precursor to a dynamical phase transition.

Fields of Study & Subjects

Cold Atom Physics and Bose-Einstein Condensates Quantum optics and atomic interactions Quantum Mechanics and Applications

Publication details

Journal / source
Physical Review Letters
Volume
136
Issue
14
Pages
140401–140401
Publication date
2 January 2026
Language
EN