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arXiv 1004.3628cond-mat.str-elhep-th
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三维分数拓扑绝缘体

Fractional topological insulators in three dimensions

Joseph Maciejko, Xiao-Liang Qi, Andreas Karch, Shou-Cheng Zhang

摘要:

拓扑绝缘体通常可以由拓扑场论定义,其中轴子角θ为0或π。在这项工作中,我们引入了分数拓扑绝缘体的概念定义的分数轴子角,并表明它可以与时间反演(T)不变性,如果基态简并存在。分数轴子角可以通过量子化的分数体磁电极化P_3和表面上的“减半”分数量子霍尔效应进行实验测量,霍尔电导为(p/q)(e^2/2 h),p,q为奇数。在最简单的这些状态中,电子表现为三个分数电荷的“夸克”耦合到一个去限制的非阿贝尔SU(3)“色”规范场的束缚态,其中夸克的分数电荷改变了P_3的量子化条件,并允许分数值与T不变性一致。

英文摘要:

Topological insulators can be generally defined by a topological field theory with an axion angle theta of 0 or pi. In this work, we introduce the concept of fractional topological insulator defined by a fractional axion angle and show that it can be consistent with time reversal (T) invariance if ground state degeneracies are present. The fractional axion angle can be measured experimentally by the quantized fractional bulk magnetoelectric polarization P_3, and a `halved' fractional quantum Hall effect on the surface with Hall conductance of the form (p/q)(e^2/2h) with p,q odd. In the simplest of these states the electron behaves as a bound state of three fractionally charged `quarks' coupled to a deconfined non-Abelian SU(3) `color' gauge field, where the fractional charge of the quarks changes the quantization condition of P_3 and allows fractional values consistent with T-invariance.

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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