论文标题
U（1）对称腔 - QED模型的仅原子理论
Atom-only theories for U(1) symmetric cavity-QED models
论文作者
论文摘要
我们考虑了具有U（1）对称性的广义DICKE模型，该模型可以自发打破这种对称性的超级态状态过渡。通过利用原子和腔动力学之间的时间尺度差异，可以消除腔动力学，提供仅原子的理论。我们表明，标准的红场理论无法描述向超级支持状态的过渡，但包括高阶校正确实恢复了过渡。我们的工作揭示了有效理论的形式对于具有连续对称性的模型必须如何变化，并提供了一个模板来开发更复杂模型的有效理论。
We consider a generalized Dicke model with U(1) symmetry, which can undergo a transition to a superradiant state that spontaneously breaks this symmetry. By exploiting the difference in timescale between atomic and cavity dynamics, one may eliminate the cavity dynamics, providing an atom-only theory. We show that the standard Redfield theory cannot describe the transition to the superradiant state, but including higher-order corrections does recover the transition. Our work reveals how the forms of effective theories must vary for models with continuous symmetry, and provides a template to develop effective theories of more complex models.
