Superradiant phase transition in the ultrastrong-coupling regime of the two-photon Dicke model

被引:65
作者
Garbe, L. [1 ]
Egusquiza, I. L. [2 ]
Solano, E. [3 ,4 ]
Ciuti, C. [1 ]
Coudreau, T. [1 ]
Milman, P. [1 ]
Felicetti, S. [1 ]
机构
[1] Univ Paris Diderot, Lab Mat & Phenomenes Quant, CNRS UMR 7162, Sorbonne Paris Cite, Paris, France
[2] Univ Basque Country, Dept Theoret Phys & Hist Sci, UPV EHU, Apartado 644, E-48080 Bilbao, Spain
[3] Univ Basque Country, Dept Phys Chem, UPV EHU, Apartado 644, E-48080 Bilbao, Spain
[4] Ikerbasque, Basque Fdn Sci, Maria Diaz de Haro 3, Bilbao 48013, Spain
关键词
QUANTUM; GAS;
D O I
10.1103/PhysRevA.95.053854
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The controllability of current quantum technologies allows one to implement spin-boson models where two-photon couplings are the dominating terms of light-matter interaction. In this case, when the coupling strength becomes comparable with the characteristic frequencies, a spectral collapse can take place, i.e., the discrete system spectrum can collapse into a continuous band. Here, we analyze the thermodynamic limit of the two-photon Dicke model, which describes the interaction of an ensemble of qubits with a single bosonic mode. We find that there exists a parameter regime where two-photon interactions induce a superradiant phase transition, before the spectral collapse occurs. Furthermore, we extend themean-field analysis by considering second-order quantum fluctuation terms, in order to analyze the low-energy spectrum and compare the critical behavior with the one-photon case.
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页数:10
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