Entanglement and excited-state quantum phase transition in an extended Dicke model

doi:10.1007/s11467-019-0921-4

Front. Phys.

2019, Vol. 14

Issue (5) : 52602 https://doi.org/10.1007/s11467-019-0921-4

RESEARCH ARTICLE

Entanglement and excited-state quantum phase transition in an extended Dicke model

Gui-Lei Zhu, Xin-You Lü(

), Shang-Wu Bin, Cai You, Ying Wu

School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

We investigate the properties of entanglement and excited-state quantum phase transition (ESQPT) in a hybrid atom-optomechanical system in which an optomechanical quadratic interaction is introduced into a normal Dicke model. Interestingly, by preparing the ancillary mode in a coherent state, both the quantum entanglement and ESQPT can be realized in a relative weak-coupling condition. Moreover, the entanglement is immune to the A² term, and a reversed trend of the entropy is obtained when the A² term is included. Density of states (DoS) and Peres lattice are used to investigate ESQPTs. Compared to a normal Dicke model, the DoS enlarges exp(2r_α) times if the ancillary mode is prepared in a coherent state. This work is an extension of the ground-state quantum phase transition, which may inspire further exploration of the quantum criticality in many-body systems.

Keywords phase transition Dicke model

Corresponding Author(s): Xin-You Lü

Issue Date: 16 September 2019

Cite this article:

Gui-Lei Zhu,Xin-You Lü,Shang-Wu Bin, et al. Entanglement and excited-state quantum phase transition in an extended Dicke model[J]. Front. Phys. , 2019, 14(5): 52602.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-019-0921-4
https://academic.hep.com.cn/fop/EN/Y2019/V14/I5/52602

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