玻色晶格系统的激发态量子相变
Excited-State Quantum Phase Transitions in Bosonic Lattice Systems
摘要：
集中在玻色子晶格系统，我们问是否以及如何激发态量子相变（ESQPT）奇异性发生在凝聚态系统与基态量子点。我们特别研究了玻色子哈伯德模型基态相图上的谱奇异性。作为一般的先决条件，我们指出ESQPT和范霍夫奇点（vHss）之间的类比。
英文摘要：
Concentrating on bosonic lattice systems, we ask whether and how Excited State Quantum Phase Transition (ESQPT) singularities occur in condensed matter systems with ground state QPTs. We study in particular the spectral singularities above the ground-state phase diagram of the boson Hubbard model. As a general prerequisite, we point out the analogy between ESQPTs and van Hove singularities (vHss).
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