Large Unidirectional Magnetoresistance in a Magnetic Topological Insulator

K. Yasuda, A. Tsukazaki, R. Yoshimi, K. S. Takahashi, M. Kawasaki, Y. Tokura

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)

Abstract

We report current-direction dependent or unidirectional magnetoresistance (UMR) in magnetic or nonmagnetic topological insulator (TI) heterostructures, Crx(Bi1-ySby)2-xTe3/(Bi1-ySby)2Te3, that is several orders of magnitude larger than in other reported systems. From the magnetic field and temperature dependence, the UMR is identified to originate from the asymmetric scattering of electrons by magnons. In particular, the large magnitude of UMR is an outcome of spin-momentum locking and a small Fermi wave number at the surface of TI. In fact, the UMR is maximized around the Dirac point with the minimal Fermi wave number.

Original languageEnglish
Article number127202
JournalPhysical review letters
Volume117
Issue number12
DOIs
Publication statusPublished - 2016 Sep 14

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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