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arXiv · 1311.6634

Observation of grand-canonical number statistics in a photon Bose-Einstein condensate

Julian Schmitt·Tobias Damm·David Dung·Frank Vewinger·Jan Klaers·Martin Weitz
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Abstract

We report measurements of particle number correlations and fluctuations of a photon Bose-Einstein condensate in a dye microcavity using a Hanbury Brown-Twiss experiment. The photon gas is coupled to a reservoir of molecular excitations, which serve both as heat bath and particle reservoir to realize grand-canonical conditions. For large reservoirs, we observe strong number fluctuations of order of the total particle number extending deep into the condensed phase. Our results demonstrate that Bose-Einstein condensation under grand-canonical ensemble conditions does not imply second-order coherence.

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Julian Schmitt, Tobias Damm, David Dung, Frank Vewinger, Jan Klaers, Martin Weitz. 2014-01-24. Observation of grand-canonical number statistics in a photon Bose-Einstein condensate. https://doi.org/10.1103/physrevlett.112.030401

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