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arXiv 1706.03221cond-mat.mes-hall
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源于分形表面的自旋霍尔效应

Spin Hall effect originated from fractal surface

I. Hajzadeh, S. M. Mohseni, S. M. S. Movahed, G. R. Jafari

摘要:

薄膜中的自旋霍尔效应(SHE)是由表面粗糙度遗传的。虽然在薄膜中已经研究了粗糙度对SHE的影响,但粗糙度并不是粗糙表面的唯一参数。我们的研究结果表明,如何粗糙表面的其他统计参数发挥重要作用,在SHE。本文在玻恩近似的框架下,研究了自仿射分形表面的非重金属薄膜SHE中相关表面粗糙度的影响。表面粗糙度由k相关模型描述,并由粗糙度指数H(0 <= H <= 1)、面内相关长度kesi和均方根粗糙度幅度δ表征。结果表明,当H从H = 1减小到H = 0时,自旋霍尔角可以增大一个数量级.我们还证明了表面粗糙度的分布函数的高斯分布的SHE主要是由侧跳散射,而与非高斯分布,侧跳和斜散射的贡献。我们的研究结果表明,在非重金属的SHE粗糙纹理轮廓的重要作用。

英文摘要:

Spin hall effect (SHE) in thin films is inherited by surface roughness. Although roughness effect on SHE has been studied in thin films, but roughness is not only parameter in rough surfaces. Our results show that how other statistical parameters of rough surface play important role in SHE. In this paper we investigate theoretically the effects of correlated surface roughness in the SHE with self affine fractal surface in non-heavy metallic thin films in the frame work of the Born approximation. The surface roughness is described by the k-correlation model and is characterized by the roughness exponent H (0 <= H <= 1), the in plane correlation length kesi and the rms roughness amplitude delta. We show that the spin Hall angle can increase by one order of magnitude when H decreasing from H = 1 to H = 0. We also demonstrate the SHE for surface roughness with distribution function of the Gaussian profile is mainly contributed by the side jump scattering while for that with a non-Gaussian profile, both side jump and skew scattering are present. our achievements demonstrate the important role of roughness texture profile for SHE in non-heavy metals.

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