Electrical Detection of the Spin Polarization Due to Charge Flow in the Surface State of the Topological Insulator Bi1.5Sb0.5Te1.7Se1.3

被引：148

作者：

Ando, Yuichiro ^{[1
,2
]}

Hamasaki, Takahiro ^{[2
]}

Kurokawa, Takayuki ^{[2
]}

Ichiba, Kouki ^{[2
]}

Yang, Fan ^{[3
]}

Novak, Mario ^{[3
]}

Sasaki, Satoshi ^{[3
]}

Segawa, Kouji ^{[3
]}

Ando, Yoichi ^{[3
]}

Shiraishi, Masashi ^{[1
]}

机构：

[1] Kyoto Univ, Dept Elect Sci & Engn, Kyoto 6158531, Japan

[2] Osaka Univ, Grad Sch Engn Sci, Toyonaka, Osaka 5608531, Japan

[3] Osaka Univ, Inst Sci & Ind Res, Osaka 5670047, Japan

来源：

NANO LETTERS | 2014年 / 14卷 / 11期

关键词：

topological insulator; spin-momentum locking; spin current; electrical spin detection; DIRAC CONE;

D O I：

10.1021/nl502546c

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We detected the spin polarization due to charge flow in the spin nondegenerate surface state of a three-dimensional topological insulator by means of an all-electrical method. The charge current in the bulk-insulating topological insulator Bi1.5Sb0.5Te1.7Se1.3 (BSTS) was injected/extracted through a ferromagnetic electrode made of Ni80Fe20, and an unusual current-direction-dependent magnetoresistance gave evidence for the appearance of spin polarization, which leads to a spin-dependent resistance at the BSTS/Ni80Fe20 interface. In contrast, our control experiment on Bi2Se3 gave null result. These observations demonstrate the importance of the Fermi-level control for the electrical detection of the spin polarization in topological insulators.

引用

页码：6226 / 6230

页数：5

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