Fig. 3: Phase diagram for a cavity mode coupled to non-critical degrees of freedom.
From: Amplified response of cavity-coupled quantum-critical systems
a Analytically obtained exact phase diagram in the full quantum limit of S = 1/2, where the color bar indicates \(\langle \widehat{a}\rangle\); red solid line marks the QCP of the one-dimensional TFIM; dashed (solid) black lines denote discontinuous (continuous) SRPTs; red dot represents the tricritical point. b Scaling of \(\langle \widehat{a}\rangle\) with \({(g-{g}_{{{\rm{c}}}})}^{\beta }\) in the vicinity of the tricritical point at h/J ≈ 0.55. The crossover behavior is dictated by Eq. (10).
