Superradiant phase transitions in the quantum Rabi model: Overcoming the no-go theorem through anisotropy

Tian Ye, Yan-Zhi Wang, Xiang-You Chen +2

Although the superradiant phase transition (SRPT) is prohibited in the paradigmatic quantum Rabi model due to the no-go theorem caused by the ${\mathbf{A}}^2$ term, we demonstrate tw…