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arXiv 1302.0856cond-mat.str-el
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Kane-Mele模型中的单个磁性杂质

Single magnetic impurities in the Kane-Mele model

Florian Goth, David J. Luitz, Fakher F. Assaad

摘要:

量子阱中自旋霍尔效应的实现引起了关于二维拓扑绝缘体边缘态性质的大量研究。这些边缘态构成了一类一维液体,称为螺旋液体,其中电子的自旋量子化轴与其动量有关。与一维导体相反,磁性杂质-低于近藤温度-不能阻止传输,并且人们期望电流绕过杂质。为了研究这一现象,我们考虑了嵌入到Kane-Mele带边缘的单个杂质Anderson模型,并使用数值精确的连续时间QMC方法研究了近藤效应.我们提出的杂质和散装系统的光谱性质的温度依赖性的结果,显示在不同的制度的安德森模型的系统的行为。利用自旋-自旋关联函数的空间行为可以得到与单粒子谱函数互补的观点。在这里,我们显示的特征,代数衰减的边缘沟道附近的杂质。

英文摘要:

The realization of the spin-Hall effect in quantum wells has led to a plethora of studies regarding the properties of the edge states of a 2D topological insulator. These edge states constitute a class of one-dimensional liquids, called the helical liquid, where an electron's spin quantization axis is tied to its momentum. In contrast to one dimensional conductors, magnetic impurities - below the Kondo temperature - cannot block transport and one expects the current to circumvent the impurity. To study this phenomenon, we consider the single impurity Anderson model embedded into an edge of a Kane-Mele ribbon with up to 512x80 sites and use the numerically exact continuous time QMC method to study the Kondo effect. We present results on the temperature dependence of the spectral properties of the impurity and the bulk system that show the behaviour of the system in the various regimes of the Anderson model. A view complementary to the single particle spectral functions can be obtained using the spatial behaviour of the spin-spin correlation functions. Here we show the characteristic, algebraic decay in the edge channel near the impurity.

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