Nonequilibrium polariton dynamics in a Bose-Einstein condensate coupled to an optical cavity

Gábor Kónya, Dávid Nagy, Gergely Szirmai, P. Domokos

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2 Citations (Scopus)


We study quasiparticle scattering effects on the dynamics of a homogeneous Bose-Einstein condensate of ultracold atoms coupled to a single mode of an optical cavity. The relevant excitations, which are polaritonlike mixed excitations of photonic and atomic density-wave modes, are identified. All the first-order correlation functions are presented by means of the Keldysh Green's function technique. Beyond confirming the existence of the resonant enhancement of Beliaev damping, we find a very structured spectrum of fluctuations. There is a spectral hole burning at half of the recoil frequency reflecting the singularity of the Beliaev scattering process. The effects of the photon-loss dissipation channel and that of the Beliaev damping due to atom-atom collisions can be well separated. We show that the Beliaev process does not influence the properties of the self-organization criticality.

Original languageEnglish
Article number063608
JournalPhysical Review A
Issue number6
Publication statusPublished - Dec 6 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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