摘要翻译:
研究了XY自旋链模型中Chern数与量子相变(QPT)的关系。通过将自旋链与单个自旋耦合,可以研究与耦合哈密顿量相关的拓扑不变量。这些不变量包含全局信息,除了通常的信息(通过积分一个闭环的Berry连接获得)。我们计算了这些不变量(Chern数)并讨论了它们与QPT的关系。特别地,我们证明了Chern数可以用来标记对应于不同相位的区域。
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英文标题:
《Berry Phases, Quantum Phase Transitions and Chern Numbers》
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作者:
H.A. Contreras (1) and A.F. Reyes-Lega (1) ((1) Departamento de
Fisica, Universidad de los Andes)
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最新提交年份:
2007
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分类信息:
一级分类:Physics 物理学
二级分类:Strongly Correlated Electrons 强关联电子
分类描述:Quantum magnetism, non-Fermi liquids, spin liquids, quantum criticality, charge density waves, metal-insulator transitions
量子磁学,非费米液体,自旋液体,量子临界性,电荷密度波,金属-绝缘体跃迁
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一级分类:Physics 物理学
二级分类:Statistical Mechanics 统计力学
分类描述:Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变,热力学,场论,非平衡现象,重整化群和标度,可积模型,湍流
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英文摘要:
We study the relation between Chern numbers and Quantum Phase Transitions (QPT) in the XY spin-chain model. By coupling the spin chain to a single spin, it is possible to study topological invariants associated to the coupling Hamiltonian. These invariants contain global information, in addition to the usual one (obtained by integrating the Berry connection around a closed loop). We compute these invariants (Chern numbers) and discuss their relation to QPT. In particular we show that Chern numbers can be used to label regions corresponding to different phases.
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PDF链接:
https://arxiv.org/pdf/710.035