Exploring Symmetry Breaking at the Dicke Quantum Phase Transition

被引：353

作者：

Baumann, K. ^{[1
]}

Mottl, R. ^{[1
]}

Brennecke, F. ^{[1
]}

Esslinger, T. ^{[1
]}

机构：

[1] ETH, Inst Quantum Elect, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 14期

关键词：

BOSE-EINSTEIN CONDENSATE; OPTICAL CAVITY; DYNAMICS; MODEL;

D O I：

10.1103/PhysRevLett.107.140402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study symmetry breaking at the Dicke quantum phase transition by coupling a motional degree of freedom of a Bose-Einstein condensate to the field of an optical cavity. Using an optical heterodyne detection scheme, we observe symmetry breaking in real time and distinguish the two superradiant phases. We explore the process of symmetry breaking in the presence of a small symmetry-breaking field and study its dependence on the rate at which the critical point is crossed. Coherent switching between the two ordered phases is demonstrated.

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页数：5

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