Multicriticality and quantum fluctuation in a generalized Dicke model
Multicriticality and quantum fluctuation in a generalized Dicke model
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DOI：
10.1103/physreva.104.043708
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发表时间：
2020-11
影响因子：
2.9
通讯作者：
Youjiang Xu;Diego Fallas Padilla;H. Pu
中科院分区：
文献类型：
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作者：
Youjiang Xu;Diego Fallas Padilla;H. Pu
我们考虑迪克模型的一个重要概括，其中多级原子而不是传统迪克模型中的两级原子与单光子模式相互作用。我们探索了一大类原子-光子耦合方案的相图，并表明，在这种概括下，迪克模型可以变得多临界。对于实验可实现方案的子类，任意阶的多临界条件可以用紧凑的形式分析地表达。我们还计算了临界和非临界情况下的原子光子纠缠熵。我们发现临界性的阶数强烈影响临界纠缠熵：阶数越高产生更强的纠缠。我们的工作提供了对量子相变和多临界性的深入见解。
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.