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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A dissipative two-mode ultrastrongly coupled bosonic system yields enhanced charging energy and ergotropy in transient and steady states through combined interactions, with the vector potential term preventing phase transitions in the deep-strong regime.
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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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Dissipative Quantum Battery in the Ultrastrong Coupling Regime Between Two Oscillators
A dissipative two-mode ultrastrongly coupled bosonic system yields enhanced charging energy and ergotropy in transient and steady states through combined interactions, with the vector potential term preventing phase transitions in the deep-strong regime.
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