关键词: 双光子过程/
耦合腔阵列/
超流-Mott绝缘相变/
准玻色子
English Abstract
Quantum phase transition in arrays of dissipative cavities with two-photon process
Xiong Fang,Feng Xiao-Qiang,
Tan Lei
1.Institute of Theoretical Physics, Lanzhou University, Lanzhou 730000, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant No. 11274148).Received Date:07 September 2015
Accepted Date:19 October 2015
Published Online:05 February 2016
Abstract:In this paper, we employ a new kind of quasi-boson approach and the mean field theory to study analytically the Hamiltonian of an array of cavities with a three-level atom embedded in each cavity in the process of two-photon resonant transition under the influence of a bosonic bath. The superfluid order parameter of the system is obtained analytically and then analyzed numerically to investigate the effects of dissipation on the quantum phase transition from the superfluid to the Mott-insulator phase. It is shown that when the two-photon resonance is achieved one can have the superfluid phase at (ZJ/)= (ZJ/)c' 0.34 in the related ideal case. Furthermore, the system while in the two-photon resonant process has a larger dissipation rate as compared with that in the one-photon resonant process, thus leading to the suppression of the long-range coherence time and enhancement of the critical hopping rate for restoring coherence.
Keywords: two-photon process/
coupled cavity arrays/
superfluid-Mott-insulator phase transition/
quasiboson
