摘要
Dicke模型中的量子相变在三十多年前已被预言,该模型描述的是N个二能级原子与单模腔场集体耦合的系统.在标准Dicke模型的基础上加入原子光的非线性相互作用和含时外场驱动,使用含时幺正变换和Holstein-Primafoff变换方法从理论上推导出基态能量表达式.并且给出了丰富的相图,而且这些性质最近已有文献从实验上验证.本文主要呈现了非线性相互作用和外场驱动对量子相变的影响.
When an atomic ensemble is coupled with a cavity field governed by the well-known Dicke model, an important quantum phase transition （QPT） from the normal phase to the superradiant phase occurs, which was predicted more than 30 years ago. In this paper, both the atom-photon nonlinear interaction and the driving field are added to the Dicke＇s Hamiltonian. With the method of Holstein- Primafoff transformation, the ground state energy is given by the theoretical calculation, and the rich phase figures are presented. Meanwhile, these properties are observed experimentally. We mainly dicuss the effects of the atom-photon nonlinear interaction and the driving field on QPT.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第1期156-160,共5页
Acta Physica Sinica
基金
国家自然科学基金(批准号:11075099
11047167
11105087)资助的课题~~
