Observation of Grand-Canonical Number Statistics in a Photon Bose-Einstein Condensate

被引：99
作者：
Schmitt, Julian [1 ]
Damm, Tobias [1 ]
Dung, David [1 ]
Vewinger, Frank [1 ]
Klaers, Jan [1 ]
Weitz, Martin [1 ]
机构：
[1] Univ Bonn, Inst Angew Phys, D-53115 Bonn, Germany
来源：
PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 03期
关键词：
HANBURY BROWN; LASER; IDEAL; GAS; FLUCTUATIONS; MICROCAVITY; COHERENCE; PARTICLES; ENSEMBLE; LIGHT;
D O I：
10.1103/PhysRevLett.112.030401
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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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页数：5
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