Magnetoelectric Response of the Time-Reversal Invariant Helical Metal

Details Magnetoelectric Response of the Time-Reversal Invariant Helical Metal Magnetoelectric Response of the Time-Reversal Invariant Helical Metal

2010-03-10

arxiv.org/abs/1003.2008v1

Phys. Rev. B 81, 172408 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures; submitted to Phys. Rev. B RC

Scientific paper

We derive compact analytical expressions for the coupled spin-charge susceptibility of a clean helical metal at the surface of a three dimensional topological insulator (TI). These expressions lead to unconventional non-collinear RKKY interactions between two impurity magnetic moments placed on the surface of a TI, and predict the generation of electric currents by time-dependent magnetic moments. We determine the influence of gate and bias voltages on the interlayer exchange coupling between two single-domain ferromagnetic monolayers deposited on top of a TI.

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