Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Poster II

Q 24.11: Poster

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

Optical quantum gases in box and ring potentials — •Patrick Gertz, Leon Espert Miranda, Andreas Redmann, Kirankumar Karkihalli Umesh, Frank Vewinger, Martin Weitz, and Julian Schmitt — Institut für Angewandte Physik, Universität Bonn, Wegelerstraße 8, 53115 Bonn, Germany

Quantum gases provide exquisite experimental control over dimensionality, shape of the energy landscape or the coupling to reservoirs, which opens the door to investigate novel states of matter both in and out of equilibrium. Here we report on the experimental realization of a quantum gas of photons inside box and ring-shaped potentials within a dye-filled optical microcavity. The trapping potential for the particles is provided by imprinting static nanostructures on the cavity mirror surface using a laser-induced delamination of the mirror coating. In a corresponding box-shaped cavity geometry, we have realized a 2D optical quantum gas at room temperature with uniform density and measured its compressibility and equation of state. In more recent work, we have achieved the quasi-1D, periodically closed confinement of photon gases in ring potentials. Prospects of this work include studies of the Kibble-Zurek mechanism and of flux qubits.

Keywords: low-dimensional systems; thermodynamics; Bose-Einstein condensation; photonics