Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 18: Photon BEC

Q 18.6: Talk

Tuesday, March 3, 2026, 12:15–12:30, P 4

On vortices in photon Bose–Einstein condensates: Open-dissipative effects on size and stability — •Joshua Krauß and Axel Pelster — Physics Department and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, Kaiserslautern, Germany

Open-dissipative quantum fluids have been extensively studied numerically [1,2]. In view of a complementary analytical description, a recent study [3] introduced the projection optimization method, generalizing the standard optimization method for closed condensates [4] to open-dissipative systems. We apply this method to a complex Gross–Pitaevskii equation [6] that heuristically models a photon Bose–Einstein condensate, which is harmonically trapped. Together with established methods from hydrodynamics, we obtain an approximate dynamical vortex solution and demonstrate how open-dissipative parameters affect vortex both size and stability.

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

[2] V.N. Gladilin and M. Wouters, New J. Phys. 19, 105005 (2017)

[3] J. Krauß et alii, Phys. Rev. Res. 7, 033007 (2025)

[4] V.M. Perez-Garcia et alii, Phys. Rev. Lett. 77, 5320 (1996)

[5] J. Keeling and N.G. Berloff, Phys. Rev. Lett. 100, 250401 (2008)

Keywords: Vortex; Open-dissipative quantum system; Topological defect; Variational solution; Stability