Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 37: Quantum Gases (Bosons) IV
Q 37.1: Vortrag
Dienstag, 6. März 2018, 14:00–14:15, K 2.020
Fluctuation-dissipation relations and finite compressibility of a grand canonical Bose-Einstein condensate — •Fahri Emre Ozturk1, Tobias Damm1, David Dung1, Christian Kurtscheid1, Erik Busley1, Frank Vewinger1, Julian Schmitt2, and Martin Weitz1 — 1Institut für Angewandte Physik, Universität Bonn, Wegelerstraße 8, 53115 Bonn, Germany — 2Present address: Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
We measure the density fluctuations and the isothermal compressibility of a two-dimensional photon Bose-Einstein condensate confined in a dye microcavity. The photon gas is coupled to a reservoir of molecular excitations, which serves both as a heat bath and a particle reservoir [1]. This leads to grand canonical statistical behavior with photon number fluctuations which can be as large as the average condensate photon number [2]. In thermal equilibrium, such fluctuations are related to the isothermal compressibility and the thermal energy kBT. We report on the progress of an ongoing experiment investigating this relation, expressed by the fluctuation-dissipation theorem, for the condensed photon gas.
[1] Klaers et al., Nature 468, 545 (2010)
[2] Schmitt et. al., Phys. Rev. Lett. 112, 030401 (2014)