Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 39: Photon BEC

Q 39.1: Talk

Wednesday, March 12, 2025, 14:30–14:45, HS V

Kardar-Parisi-Zhang Universality in a Two-Dimensional Photon Bose-Einstein Condensate — •Joshua Krauß and Axel Pelster — Physics Department and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, Germany

Recent experimental and numerical studies reveal that exciton-polariton condensates in an asymmetric Lieb lattice belong to the KPZ universality class [1]. However, achieving stable KPZ scaling requires a negative polariton mass, restricting experiments to one-dimensional lattices. Photon Bose-Einstein condensates offer offer a promising realization in two dimensions without a lattice.

We describe the dynamics of a photon BEC using a stochastic generalized Gross-Pitaevskii equation coupled to a stochastic rate equation for the bath of dye molecules [2]. Following Refs. [2,3], we incorporate a continuum analogue of incoherent hopping processes, which occur in photon BEC lattices. Using methods from exciton-polariton studies [1], we approximately map these dynamics to the KPZ equation. Additionally, we show that incoherent hopping significantly enhances effective photon-photon interactions for realistic experimental parameters.

[1] Q. Fontaine et alii, Nature 608, 687 (2022).

[2] V. N. Gladilin and M. Wouters, Phys. Rev. A 101, 043814 (2020).

[3] V. N. Gladilin and M. Wouters, Phys. Rev. Lett. 125, 215301 (2020).

Keywords: Photon Bose-Einstein condensate; Open-dissipative quantum system; Gross-Pitaevskii equation; Quantum fluid of light; KPZ universality