arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.11549cond-mat.str-elcond-mat.other
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Kitaev模型-- I简介

An introduction to Kitaev model-I

Saptarshi Mandal, Arun M Jayannavar

摘要:

这篇教学文章的目的是为了开始研究生感兴趣的广泛领域的挫折磁性。我们介绍并给出了Kitaev模型中得到的一些精确结果。Kitaev模型体现了一个不寻常的双自旋相互作用,但在二维精确可解的模型。这种精确可解性使它可以精确地实现许多涌现的多体现象,如$Z_2$规范场、自旋液态、自旋分形、拓扑序等。首先给出了Kitaev模型的Majorana费米子化精确解,并详细讨论了$Z_2$规范结构。在此基础上,我们讨论了磁化强度的精确计算,自旋-自旋关联函数的建立,从而确定了它的自旋液体性质。详细解释了Majorana费米子的自旋分馏和去禁闭现象。讨论了长程多自旋关联函数的存在性和拓扑简并性,阐明了任意本征态的纠缠和拓扑性质。在适当的地方提供了一些基本的调查表,以便吸收技术细节。

英文摘要:

This pedagogical article is aimed to the beginning graduate students interested in broad field of frustrated magnetism. We introduce and present some of the exact results obtained in Kitaev model. The Kitaev model embodies an unusual two spin interactions yet exactly solvable model in two dimension. This exact solvability renders it to realize many emergent many body phenomena such as $Z_2$ gauge field, spin liquid states, spin fractionalization, topological order exactly. First we present the exact solution of Kitaev model using Majorana fermionisation and elaborate in detail the $Z_2$ gauge structure. Following this we discuss exact calculation of magnetization, spin-spin correlation function establishing its spin-liquid character. Spin fractionalization and de-confinement of Majorana fermion is explained in detail. Existence of long range multi-spin correlation function and topological degeneracy are discussed to elucidate the entangled and topological nature of any eigenstate. Some elementary questionnaires are provided in appropriate places for assimilation of the technical details.

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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