Accurate numerical solution to the finite-size Dicke model

Abstract

By using extended bosonic coherent states, a new technique to solve the Dicke model exactly is proposed in the numerical sense. The accessible system size is two orders of magnitude higher than that reported in literature. Finite-size scaling for several observables, such as the ground-state energy, Berry phase, and concurrence are analyzed. The existing discrepancy for the scaling exponent of the concurrence is reconciled.

4 pages, 5 figures. Phys. Rev. A (in press, a Rapid Communication)

References in corpus (6)

• Strongly Interacting Polaritons in Coupled Arrays of Cavities
• Quantum phase transitions of light
• Geometric phases and criticality in spin chain systems
• Direct equivalence between quantum phase transition phenomena in radiation-matter and magnetic systems: scaling of entanglement
• Scaling of Berry's Phase Close to the Dicke Quantum Phase Transition
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Cited by in corpus (2)

• Coherent State Description of the Ground State in the Tavis-Cummings Model and its Quantum Phase Transitions
• Quantum phase transition in the one-dimensional period-two and uniform compass model