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Mesoscopic fluctuations of conductance of a helical edge contaminated by magnetic impurities

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arxiv 1301.1185 v1 pith:AFUPCH6D submitted 2013-01-07 cond-mat.mes-hall

Mesoscopic fluctuations of conductance of a helical edge contaminated by magnetic impurities

classification cond-mat.mes-hall
keywords backscatteringconductanceimpuritiesmagneticedgefluctuationshelicalalong
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Elastic backscattering of electrons moving along the helical edge is prohibited by time-reversal symmetry (TRS). We demonstrate, however, that an ensemble of magnetic impurities may cause TRS-preserving quasi-elastic backscattering, resulting in interference effects in the conductance. The characteristic energy transferred in a backscattering event is suppressed due to the RKKY interaction of localized spins (the suppression is exponential in the total number of magnetic impurities). We predict the statistics of conductance fluctuations to differ from those in the conventional case of a one-dimensional system with quenched disorder.

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