Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Poster II

Q 24.3: Poster

Dienstag, 12. März 2024, 17:00–19:00, KG I Foyer

Dimensional Crossover in a Quantum Gas of Light — •Kirankumar Karkihalli Umesh¹, Julian Schulz², 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, 67663 Kaiserslautern, Germany

We experimentally study the properties of a harmonically trapped photon gas undergoing Bose-Einstein condensation along the dimensional crossover from one to two dimensions. The photons are trapped inside a dye microcavity, where polymer nanostructures provide a harmonic trapping potential for the photon gas. By varying the aspect ratio of the trap we tune from an isotropic two-dimensional confinement to an anisotropic, highly elongated one-dimensional trapping potential. Along this transition, we determine caloric properties of the photon gas, and find a softening of the second-order Bose-Einstein condensation phase transition observed in two dimensions to a crossover behaviour in one dimension.

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