Emergent Universality in a Quantum Tricritical Dicke Model

Abstract

We propose a generalized Dicke model which supports a quantum tricritical point. We map out the phase diagram and investigate the critical behaviors of the model through exact low-energy effective Hamiltonian in the thermodynamic limit. As predicted by the Landau theory of phase transition, the order parameter shows non-universality at the tricritical point. Nevertheless, as a result of the separation of the classical and the quantum degrees of freedom, we find a universal relation between the excitation gap and the entanglement entropy for the entire critical line including the tricritical point. Here the universality is carried by the emergent quantum modes, whereas the order parameter is determined classically.

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• Generalized coherent-squeezed-state expansion for the quantum Rabi model
• Conventional and unconventional Dicke models: Multistabilities and nonequilibrium dynamics
• Multicriticality and quantum fluctuation in generalized Dicke model
• Characteristics of grassy ELMs and its impact on the divertor heat flux width
• Interplay of quantum phase transition and flat band in hybrid lattices
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• Quantum phase transition of the two-dimensional Rydberg atom array in an optical cavity
• Tricritical Dicke model with and without dissipation
• Quantum Simulation of an Extended Dicke Model with a Magnetic Solid
• Quantum tricritical point emerging in the spin-boson model with two dissipative spins in staggered biases
• Superradiant phase transition induced by the indirect Rabi interaction
• Chiral Quantum Phases and Tricriticality in a Dicke Triangle
• Quantum Phase Transitions in a Generalized Dicke Model
• Controlling Symmetries and Quantum Criticality in the Anisotropic Coupled-Top Model
• Observe novel tricritical phenomena in self-organized Fermi gas induced by higher order Fermi surface nesting
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• Quantum Multicritical Behavior for Coupled Optical Cavities with Driven Laser Fields