Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 39: Photon BEC
Q 39.4: Vortrag
Mittwoch, 12. März 2025, 15:15–15:30, HS V
Ghost fixed point dynamics of driven-dissipative BEC — •Moritz Janning1 and Johann Kroha1,2 — 1Physikalisches Institut, Rheinische Friedrich-Wilhelms-Universität Bonn — 2University of St. Andrews, North Haugh
We investigate the driven-dissipative dynamics of an open photon BEC in a single-mode microcavity filled with dye molecules using the Lindblad master-equation approach. While one would expect a dephasing behaviour due to the driven-dissipative nature of the system a stationary condensate has been observed experimentally1. In recent theoretical investigations we were able to predict such a long lived stationary condensate which then dephases after a time farly outreaching the experimental observation. Interestingly, the quasi-stationary condensate is strongly influenced by the presence of a ghost fixed point, and its lifetime can be controlled by the driving parameters. This fixed point also enables a crossover to an oscillatory behavior that was experimentally observed as a non-hermitean phase transition1. The precise point of the non-hermitian phase transition can subsequently be understood as an exceptional point within the framework of nonlinear dynamics. [1] F. E. Öztürk et al., Science, 372, 6537, pp. 88-91 (2021)
Keywords: Optical cavities; Bose-Einstein condensate; Open quantum systems; Lindblad formalism; Exceptional points