期刊
NANO LETTERS
卷 14, 期 11, 页码 6226-6230出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl502546c
关键词
topological insulator; spin-momentum locking; spin current; electrical spin detection
类别
资金
- JSPS (KAKENHI) [25220708]
- MEXT (Innovative Area Topological Quantum Phenomena KAKENHI) [22103004, 25103715]
- MEXT (Innovative Area Nano Spin Conversion Science KAKENHI) [26103003]
- AFOSR [AOARD 124038]
- Grants-in-Aid for Scientific Research [26103003, 22103001, 25103715, 25600076, 22103004] Funding Source: KAKEN
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.
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