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Published on: October 13, 2017
Synchronization of Quasiparticle Excitations in a Quantum Gas with Cavity-Mediated Interactions
Gabriele Natale1, Alexander Baumgärtner1, Justyna Stefaniak1
1ETH Zurich, Institute for Quantum Electronics, Otto-Stern-Weg 1, CH-8093 Zurich, Switzerland.
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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.
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