Universal dynamics of the superradiant phase transition in the anisotropic quantum Rabi model

被引:8
作者
Jiang, Xunda [1 ,2 ,3 ,4 ]
Lu, Bo [2 ,3 ]
Han, Chengyin [2 ,3 ]
Fang, Ruihuan [2 ,3 ,4 ]
Zhao, Minhua [2 ,3 ,4 ]
Ma, Zhu [2 ,3 ,4 ]
Guo, Tian [2 ,3 ,4 ]
Lee, Chaohong [2 ,3 ,4 ]
机构
[1] Foshan Univ, Sch Phys & Optoelect Engn, Foshan 528000, Peoples R China
[2] Sun Yat Sen Univ, Guangdong Prov Key Lab Quantum Metrol & Sensing, Zhuhai Campus, Zhuhai 519082, Peoples R China
[3] Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai Campus, Zhuhai 519082, Peoples R China
[4] Sun Yat Sen Univ, State Key Lab Optoelect Mat & Technol, Guangzhou Campus, Guangzhou 510275, Peoples R China
关键词
COSMOLOGICAL EXPERIMENTS; SYMMETRY;
D O I
10.1103/PhysRevA.104.043307
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We investigate the universal nonequilibrium dynamics of the superradiant phase transition in the anisotropic quantum Rabi model. By introducing position and momentum operators, we find the generators and the displaced operators to diagonalize the anisotropic Hamiltonian, and then obtain the ground states and their excitation gaps. According to the Kibble-Zurek mechanism, we find that the excitation gap near the critical point vanishes as I El" with vz = 1/2, and the length scale diverges according to E', which determines the universality class (z = 2, v = 1/4) of the anisotropic quantum Rabi model. Moreover, by simulating the real-time dynamics across the critical point, we numerically extract the critical exponents from the phase transition delay +vz) and the diverging length scale Ax, Ap -cQvI(1 ') (where 7Q is the quench time). The numerical critical exponents are well consistent with the analytical ones. Our study provides a dynamic way to explore universal critical behaviors in the anisotropic quantum Rabi model.
引用
收藏
页数:10
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