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• W2945828265 abstract "Abstract The quantum Rabi-Stark model, where the linear dipole coupling and the nonlinear Stark-like coupling is present on an equal footing, is studied within the tunable extended coherent states. The eigenvalues and eigenstates are therefore obtained exactly. Surprisingly, the entanglement entropy in the ground-state is found to jump suddenly with the coupling strength. The first-order quantum phase transition can be detected by level crossing of the ground state and the first excited state, which is however lacking in the original linear quantum Rabi model. Performing the first-order approximation in the present theory, we can derive closed-form analytical results for the ground-state. Interestingly, it agrees well with the exact solutions up to the ultra-strong coupling regime in a wide range of model parameters. The spectral collapses when the absolute value of the nonlinear coupling strength approaches to twice the cavity frequency is observed with the help of new solutions in the limits ." @default.
• W2945828265 created "2019-05-29" @default.
• W2945828265 creator A5076407770 @default.
• W2945828265 creator A5079300583 @default.
• W2945828265 date "2019-05-01" @default.
• W2945828265 modified "2023-10-18" @default.
• W2945828265 title "Exact Solutions to the Quantum Rabi-Stark Model Within Tunable Coherent States*" @default.
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• W2945828265 doi "https://doi.org/10.1088/0253-6102/71/5/623" @default.
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