Helical edge transport in the presence of a magnetic impurity

Abstract

We consider the effects of electron scattering off a quantum magnetic impurity on the current–voltage characteristics of the helical edge of a two-dimensional topological insulator. We compute the backscattering contribution to the current along the edge for a general form of the exchange interaction matrix and arbitrary value of the magnetic impurity spin. We find that the differential conductance may exhibit a nonmonotonic dependence on the voltage with several extrema.

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Correspondence to I. S. Burmistrov.

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Kurilovich, P.D., Kurilovich, V.D., Burmistrov, I.S. et al. Helical edge transport in the presence of a magnetic impurity. Jetp Lett. 106, 593–599 (2017). https://doi.org/10.1134/S0021364017210020

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