Single atom anisotropic magnetoresistance on a topological insulator surface

Awadhesh Narayan, Ivan Rungger, Stefano Sanvito

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

© 2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. We demonstrate single atom anisotropic magnetoresistance on the surface of a topological insulator, arising from the interplay between the helical spin-momentum-locked surface electronic structure and the hybridization of the magnetic adatom states. Our first-principles quantum transport calculations based on density functional theory for Mn on Bi2Se3 elucidate the underlying mechanism. We complement our findings with a two dimensional model valid for both single adatoms and magnetic clusters, which leads to a proposed device setup for experimental realization. Our results provide an explanation for the conflicting scattering experiments on magnetic adatoms on topological insulator surfaces, and reveal the real space spin texture around the magnetic impurity.
Original languageEnglish (US)
Pages (from-to)033021
JournalNew Journal of Physics
Volume17
Issue number3
DOIs
StatePublished - Mar 12 2015
Externally publishedYes

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