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Localization and spin transport in honeycomb structures with spin-orbit coupling

机译:具有自旋-轨道耦合的蜂窝结构中的定位和自旋输运

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Transfer-matrix methods are used for a tight-binding description of electron transport in graphenelike geometries in the presence of spin-orbit couplings. Application of finite-size scaling and phenomenological renormalization techniques shows that, for strong enough spin-orbit interactions and increasing on-site disorder, this system undergoes a metal-insulator transition characterized by the exponents v = 2.71(8), η = 0.174(2). We show how one can extract information regarding spin polarization decay with distance from an injection edge, from the evolution of wave-function amplitudes in the transfer-matrix approach. For (relatively weak) spin-orbit coupling intensity μ, we obtain that the characteristic length Λ_s for spin-polarization decay behaves as Λ_s α μ~(-2).
机译:转移矩阵方法用于自旋轨道耦合存在下石墨烯状几何结构中电子传输的紧密结合描述。有限尺寸缩放和现象学重新归一化技术的应用表明,对于足够强的自旋轨道相互作用和增加的现场无序性,该系统经历了金属-绝缘体转变,其特征在于指数v = 2.71(8),η= 0.174( 2)。我们展示了如何从传递矩阵方法中波函数幅度的演变中提取与自注入边缘的距离有关的自旋极化衰减的信息。对于(相对较弱的)自旋轨道耦合强度μ,我们获得了自旋极化衰减的特征长度Λ_s表现为Λ_sαμ〜(-2)。

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