Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 39: Photon BEC

Q 39.3: Vortrag

Mittwoch, 12. März 2025, 15:00–15:15, HS V

Photon condensates in anisotropic traps: Dimensional crossover — •Kirankumar Karkihalli Umesh¹, Julian Schulz², Sven Enns², Julian Schmitt¹, Martin Weitz¹, Georg von Freymann^2,3, and Frank Vewinger¹ — ¹Institut für Angewandte Physik, Universität Bonn, Wegelerstrasse 8, 53115 Bonn, Germany — ²Physics Department and Research Center OPTIMAS, RPTU Kaiserslautern Landau, 67663 Kaiserslautern, Germany — ³Fraunhofer Institute for Industrial Mathematics ITWM, Kaiserslautern, Germany

Recent advances in confinement technology based on 3D Direct Laser Writing (DLW) of nanostructures for dye-filled microcavities have allowed for an observation of a dimensional crossover in a bosonic system, namely non-interacting bosons (Nat. Phys. 20, 1810-1815 (2024)). In our system, photons are trapped in microscopic structures, and they thermalise by radiative coupling to a heat bath of dye molecules. In this system, we have observed the softening of the phase transition to a Bose-Einstein condensate when crossing from a harmonically trapped gas in a 2D to a 1D system. The technology used has the potential to realise arbitrary potentials for light, including lattice structures and traps with large trapping frequencies, allowing us to engineer interesting potential landscapes for photons to explore physics which has been inaccessible until now. We will present our latest results on lattice structures required to observe non-Hermitian dynamics-induced vortices in non-interacting bosons (Phys. Rev. Lett. 125, 215301 (2020)).

Keywords: Dimensional crossover; Photon BEC; Microcavity; Direct Laser writing