Large Unidirectional Magnetoresistance in a Magnetic Topological Insulator

被引：174

作者：

Yasuda, K. ^{[1
,2
]}

Tsukazaki, A. ^{[3
]}

Yoshimi, R. ^{[4
]}

Takahashi, K. S. ^{[4
]}

Kawasaki, M. ^{[1
,2
,4
]}

Tokura, Y. ^{[1
,2
,4
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[2] Univ Tokyo, QPEC, Tokyo 1138656, Japan

[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[4] RIKEN, CEMS, Wako, Saitama 3510198, Japan

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 117卷 / 12期

基金：

日本学术振兴会;

关键词：

SINGLE DIRAC CONE; TORQUE; BI2SE3; STATES;

D O I：

10.1103/PhysRevLett.117.127202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report current-direction dependent or unidirectional magnetoresistance (UMR) in magnetic or nonmagnetic topological insulator (TI) heterostructures, Cr-x(Bi1-ySby)(2-x)Te-3/(Bi1-ySby)(2)Te-3, 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.

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页数：5

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