Print Email Facebook Twitter Magnetic-proximity-induced magnetoresistance on topological insulators Title Magnetic-proximity-induced magnetoresistance on topological insulators Author Chiba, Takahiro (Tohoku University) Takahashi, Saburo (Tohoku University) Bauer, G.E. (TU Delft QN/Bauer Group; Tohoku University; Kavli institute of nanoscience Delft) Date 2017-03-28 Abstract We theoretically study the magnetoresistance (MR) of two-dimensional massless Dirac electrons as found on the surface of three-dimensional topological insulators (TIs) that are capped by a ferromagnetic insulator (FI). We calculate charge and spin transport by Kubo and Boltzmann theories, taking into account the ladder-vertex correction and the in-scattering due to normal and magnetic disorder. The induced exchange splitting is found to generate an electric conductivity that depends on the magnetization orientation, but its form is very different from both the anisotropic and the spin Hall MR. The in-plane MR vanishes identically for nonmagnetic disorder, while out-of-plane magnetizations cause a large MR ratio. On the other hand, we do find an in-plane MR and planar Hall effect in the presence of magnetic disorder aligned with the FI magnetization. Our results may help us understand recent transport measurements on TI|FI systems. To reference this document use: http://resolver.tudelft.nl/uuid:d0a17232-9216-426b-ac52-7b861a805a45 DOI https://doi.org/10.1103/PhysRevB.95.094428 ISSN 1098-0121 Source Physical Review B (Condensed Matter and Materials Physics), 95 (9) Part of collection Institutional Repository Document type journal article Rights © 2017 Takahiro Chiba, Saburo Takahashi, G.E. Bauer Files PDF PhysRevB.95.094428.pdf 764.81 KB Close viewer /islandora/object/uuid:d0a17232-9216-426b-ac52-7b861a805a45/datastream/OBJ/view