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セガワ コウジ
SEGAWA KOJI
瀬川 耕司 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2014/11 |
| 形態種別 | 研究論文 |
| 標題 | Electrical Detection of the Spin Polarization Due to Charge Flow in the Surface State of the Topological Insulator Bi1.5Sb0.5Te1.7Se1.3 |
| 執筆形態 | その他 |
| 掲載誌名 | NANO LETTERS |
| 出版社・発行元 | AMER CHEMICAL SOC |
| 巻・号・頁 | 14(11),pp.6226-6230 |
| 著者・共著者 | Yuichiro Ando,Takahiro Hamasaki,Takayuki Kurokawa,Kouki Ichiba,Fan Yang,Mario Novak,Satoshi Sasaki,Kouji Segawa,Yoichi Ando,Masashi Shiraishi |
| 概要 | 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. |
| DOI | 10.1021/nl502546c |
| ISSN | 1530-6984/1530-6992 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84910120768&origin=inward |