Observation of grand-canonical number statistics in a photon Bose-Einstein condensate.
نویسندگان
چکیده
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.
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عنوان ژورنال:
- Physical review letters
دوره 112 3 شماره
صفحات -
تاریخ انتشار 2014