Observation of grand-canonical number statistics in a photon bose-einstein condensate

Julian Schmitt*, Tobias Damm, David Dung, Frank Vewinger, Jan Klaers, Martin Weitz

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

102 Citations (Scopus)

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 as both heat bath and particle reservoir to realize grand-canonical conditions. For large reservoirs, we observe strong number fluctuations of the 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.

Original languageEnglish
Article number030401
JournalPhysical review letters
Volume112
Issue number3
DOIs
Publication statusPublished - 21 Jan 2014
Externally publishedYes

Keywords

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