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- W3208700531 abstract "We consider an important generalization of the Dicke model in which multi-level atoms, instead of two-level atoms as in conventional Dicke model, interact with a single photonic mode. We explore the phase diagram of a broad class of atom-photon coupling schemes and show that, under this generalization, the Dicke model can become multicritical. For a subclass of experimentally realizable schemes, multicritical conditions of arbitrary order can be expressed analytically in compact forms. We also calculate the atom-photon entanglement entropy for both critical and non-critical cases. We find that the order of the criticality strongly affects the critical entanglement entropy: higher order yields stronger entanglement. Our work provides deep insight into quantum phase transitions and multicriticality." @default.
- W3208700531 created "2021-11-08" @default.
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- W3208700531 date "2021-10-22" @default.
- W3208700531 modified "2023-10-02" @default.
- W3208700531 title "Multicriticality and quantum fluctuation in a generalized Dicke model" @default.
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- W3208700531 doi "https://doi.org/10.1103/physreva.104.043708" @default.
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