Comments on "Controlling Discrete and Continuous Symmetries in Superradiant Phase Transitions with Circuit QED Systems "

Yu Yi-Xiang, Jinwu Ye, W. M. Liu +1

Recently, the authors of the commented PRL presented the $N=\infty$ solution of the $U(1)/Z_2$ Dicke model studied by us previously. Here we point out that (1) The authors miss…