Work

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

Year: 2014

Type: article

Abstract: 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.

Source: Nano Letters

DOI: 10.1021/nl502546c

Authors: Yuichiro Ando, Takahiro Hamasaki, Takayuki Kurokawa, Kouki Ichiba, Fan Yang, Mario Novak, Satoshi Sasaki, Kouji Segawa, Yoichi Ando, Masashi Shiraishi

Institutions: Kyoto University, The Institute of Scientific and Industrial Research, The University of Osaka, The University of Osaka

Language: English

Topic: Topological Materials and Phenomena

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Asian Office of Aerospace Research and Development, Ministry of Education, Culture, Sports, Science and Technology, Japan Society for the Promotion of Science, Air Force Office of Scientific Research

Awards: Detection of pure spin current in topological insultors by using the inverse spin Hall effect, G2163313446, トポロジカル絶縁体･超伝導体における新奇な量子現象の探求, G5605023542, G5821199064, G7314887428, G8192318976

OpenAlex ID: W2017940090

FWCI: 8.673

Cites: 28

Cited by: 167

Related to: 10