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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster: Quantum Optics and Photonics I

Q 38.4: Poster

Dienstag, 6. März 2018, 16:15–18:15, Orangerie

Reservoir-induced collapse and revival of photon-BEC oscillations — Bastian Havers¹, •Tim Lappe¹, and Johann Kroha^{1, 2} — ¹Physikalisches Institut and Bethe Center for Theoretical Physics, Universität Bonn, Nussallee 12, 53115 Bonn, Germany — ²Center for Correlated Matter, Zhejiang University, Hangzhou, Zhejiang 310058, China

Bose-Einstein condensation of light was first realized in 2010 by filling a photon gas into a dye-filled optical microcavity and subsequently thermalizing it at room temperature. Recently, mirror delamination has enabled the creation of double-well potentials for the photons, such that Rabi or Josephson oscillations can be observed. For short reabsorption times of the photons by the dye, these undergo a collapse and revival. We describe this effect in terms of the non-Markovian dynamics of the bath of dye-molecule excitations. To study the nonequilibrium dynamics, we use the Keldysh technique in a path-integral formulation. The dye molecule excitations are modeled by a miniband of bosonic excitations, which is a good approximation for the realistic case of low excitation density. We take into account cavity losses as well as nonradiative decay and transverse dephasing in the dye. We find a crossover from a regime of normal Josephson oscillations to collapse-and-revival dynamics, depending on system parameters like the cavity cutoff and the photon-dye coupling. This illuminates the physically important processes that are responsible for collapse and revival in the system.