Spectral collapse in the anisotropic two-photon quantum Rabi model is a genuine continuous quantum phase transition governed by a soft mode with zν = 1/2, placing it in the universality class of the standard Rabi model.
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In fully connected models, integrability remains robust against non-extensive and extensive one-body perturbations but becomes extremely fragile under extensive two-body perturbations, which trigger chaos at infinitesimal strength within symmetry-defined energy bands and produce fragmented eigenstte
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Quantum criticality from spectral collapse in the two-photon Rabi model
Spectral collapse in the anisotropic two-photon quantum Rabi model is a genuine continuous quantum phase transition governed by a soft mode with zν = 1/2, placing it in the universality class of the standard Rabi model.
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Fragmented eigenstate thermalization versus robust integrability in long-range models
In fully connected models, integrability remains robust against non-extensive and extensive one-body perturbations but becomes extremely fragile under extensive two-body perturbations, which trigger chaos at infinitesimal strength within symmetry-defined energy bands and produce fragmented eigenstte