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arXiv 1401.3017cond-mat.str-el
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Kagome晶格莫特绝缘体中的手征自旋液体和出射任意子

Chiral spin liquid and emergent anyons in a Kagome lattice Mott insulator

B. Bauer, L. Cincio, B. P. Keller, M. Dolfi, G. Vidal, S. Trebst, A. W. W. Ludwig

摘要:

几十年来,受挫折的量子自旋系统中的拓扑相一直吸引着研究人员。最早提出这种相的是由Kalmeyer和Laughlin在1987年提出的手性自旋液体,作为分数量子霍尔效应的玻色子模拟物。多年来一直难以捉摸,最近终于看到了一些实现这一阶段的模型。然而,这些模型有些人为,不太可能在现实材料中找到。在这里,我们采取了重要的一步,通过检查一个物理动机的模型,一个莫特绝缘体上的Kagome晶格与破缺的时间反转对称性的目标,找到一个手性自旋液体在自然界中。我们首先提供了一个理论上的理由,新兴的手性自旋液相的网络模型的角度来看。然后,我们提出了一个明确的数值识别和表征的普遍的拓扑性质的阶段,包括基态简并,边缘物理,和任何散装激发,通过使用各种强大的数值探针,包括纠缠谱和模块化的转换。

英文摘要:

Topological phases in frustrated quantum spin systems have fascinated researchers for decades. One of the earliest proposals for such a phase was the chiral spin liquid put forward by Kalmeyer and Laughlin in 1987 as the bosonic analogue of the fractional quantum Hall effect. Elusive for many years, recent times have finally seen a number of models that realize this phase. However, these models are somewhat artificial and unlikely to be found in realistic materials. Here, we take an important step towards the goal of finding a chiral spin liquid in nature by examining a physically motivated model for a Mott insulator on the Kagome lattice with broken time-reversal symmetry. We first provide a theoretical justification for the emergent chiral spin liquid phase in terms of a network model perspective. We then present an unambiguous numerical identification and characterization of the universal topological properties of the phase, including ground state degeneracy, edge physics, and anyonic bulk excitations, by using a variety of powerful numerical probes, including the entanglement spectrum and modular transformations.

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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