Emergent symmetry at superradiance transition of a Bose condensate in two crossed beam cavities

Wu, Zhigang1,2,3; Chen, Yu4; Zhai, Hui3,5

2018-05-15

10.1016/j.scib.2018.04.008

Science Bulletin   影响因子和分区

2095-9273

2095-9281

Recently an experiment on superradiant transition of a Bose condensate in two crossed beam cavities has been reported by Leonard et al. in Nature 543, 87 (2017). The surprise is they find that across the superradiant transition, the cavity light can be emitted in any superposition of these two cavity modes. This indicates an additional U(1) symmetry that does not exist in the full Hamiltonian. In this paper we show that this symmetry is an emergent symmetry in the vicinity of the phase transition. We identify all the necessary conditions that are required for this emergent U(1) symmetry and show that this experiment is a special case that satisfies these conditions. We further show that the superradiant transition in this system can also be driven to a first order one when the system is tuned away from the point having the emergent symmetry. (C) 2018 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.

Bose-Einstein condensate Emergent symmetry Superradiance transition Cavity

SCI ; EI

英语

第一 ; 通讯

Foundation of Beijing Education Committees[KM201710028004]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:000432524700006

SCIENCE PRESS

20181905177296

Bose-Einstein condensation ; Radiation ; Statistical mechanics

Electromagnetic Waves:711 ; Light, Optics and Optical Devices:741 ; Mathematical Statistics:922.2 ; Physical Properties of Gases, Liquids and Solids:931.2

Web of Science

1.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518000, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518000, Peoples R China
3.Tsinghua Univ, Inst Adv Study, Beijing 100084, Peoples R China
4.Capital Normal Univ, Dept Phys, Beijing 100048, Peoples R China
5.Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China

Wu, Zhigang,Chen, Yu,Zhai, Hui. Emergent symmetry at superradiance transition of a Bose condensate in two crossed beam cavities[J]. Science Bulletin,2018,63(9):542-547.

Wu, Zhigang,Chen, Yu,&Zhai, Hui.(2018).Emergent symmetry at superradiance transition of a Bose condensate in two crossed beam cavities.Science Bulletin,63(9),542-547.

Wu, Zhigang,et al."Emergent symmetry at superradiance transition of a Bose condensate in two crossed beam cavities".Science Bulletin 63.9(2018):542-547.