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arXiv 0912.3272cond-mat.str-elcond-mat.stat-mech
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拓扑序与量子临界性

Topological Order and Quantum Criticality

Claudio Castelnovo, Simon Trebst, Matthias Troyer

摘要:

在这一章中,我们讨论的量子临界行为,发生在一个量子相变分离的拓扑阶段从一个传统的有序。我们集中在一个家庭的量子晶格模型,即某些变形的复曲面代码模型,表现出连续的量子相变。一个这样的变形导致在3D伊辛普适类中的洛伦兹不变跃迁。另一种变形产生了一个所谓的共形量子临界点,在这个点上,等时相关性变得共形不变,并且可以与二维伊辛模型的相关性相关联。我们研究了几个物理观测量的行为,如非局域算符和纠缠熵,可以用来描述这些量子相变。最后,我们简要地考虑了热涨落和相关的相变的作用,在关闭这些量子临界点的场论描述的简短概述。

英文摘要:

In this chapter we discuss aspects of the quantum critical behavior that occurs at a quantum phase transition separating a topological phase from a conventionally ordered one. We concentrate on a family of quantum lattice models, namely certain deformations of the toric code model, that exhibit continuous quantum phase transitions. One such deformation leads to a Lorentz-invariant transition in the 3D Ising universality class. An alternative deformation gives rise to a so-called conformal quantum critical point where equal-time correlations become conformally invariant and can be related to those of the 2D Ising model. We study the behavior of several physical observables, such as non-local operators and entanglement entropies, that can be used to characterize these quantum phase transitions. Finally, we briefly consider the role of thermal fluctuations and related phase transitions, before closing with a short overview of field theoretical descriptions of these quantum critical points.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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