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Electrical control of the Kondo effect in a helical edge liquid

机译:螺旋边缘液体中近藤效应的电气控制

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摘要

Magnetic impurities affect the transport properties of the helical edge states of quantum spin Hall insulators by causing single-electron backscattering. We study such a system in the presence of a Rashba spin-orbit interaction induced by an external electric field, showing that this can be used to control the Kondo temperature, as well as the correction to the conductance due to the impurity. Surprisingly, for a strongly anisotropic electron-impurity spin exchange, Kondo screening may get obstructed by the presence of a noncollinear spin interaction mediated by the Rashba coupling. This challenges the expectation that the Kondo effect is stable against time-reversal invariant perturbations.
机译:磁性杂质会引起单电子反向散射,从而影响量子自旋霍尔绝缘体的螺旋边缘态的传输特性。我们在存在外部电场引起的Rashba自旋轨道相互作用的情况下研究了这样的系统,表明该系统可用于控制近藤温度,以及由于杂质引起的电导校正。出乎意料的是,对于强各向异性的电子杂质自旋交换,Kondo筛选可能会受到Rashba耦合介导的非共线自旋相互作用的阻碍。这挑战了近藤效应对时间反向不变摄动稳定的期望。

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