Dicke模型中可分态与相变的重叠：零温度与有限温度
Overlap with the Separable State and Phase Transition in the Dicke Model: Zero and Finite Temperature
摘要：
为了刻画多体系统的整体关联性，本文引入了与可分态的重叠。该定义具有明确的几何和物理意义，而且可以看作是Anderson随机性突变概念的推广。作为一个例子，它被用来标记的相变在迪克模型的零和有限的温度。我们的讨论表明，无论是零温还是有限温，它都能真实地反映该模型的相变性质。此外，基态的重叠也表明了Dicke模型中多体纠缠的出现。
英文摘要：
Overlap with the separable state is introduced in this paper for the purpose of characterizing the overall correlation in many-body systems. This definition has clear geometric and physical meaning, and moreover can be considered as the generalization of the concept-Anderson Orthogonality Catastrophe. As an exemplification, it is used to mark the phase transition in the Dicke model for zero and finite temperature. And our discussion shows that it can faithfully reflect the phase transition properties of this model whether for zero or finite temperature. Furthermore the overlap for ground state also indicates the appearance of multipartite entanglement in Dicke model.
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