Direct visualization of current-induced spin accumulation in topological insulators

Liu, Y, Besbas, J, Wang, Y, He, P, Chen, M, Zhu, D, Wu, Y, Lee, J, Wang, L, Moon, J, Koirala, N, Oh, S and Yang, H 2018, 'Direct visualization of current-induced spin accumulation in topological insulators', Nature Communications, vol. 9, no. 1, pp. 1-6.

Document type: Journal Article
Collection: Journal Articles

Title Direct visualization of current-induced spin accumulation in topological insulators
Author(s) Liu, Y
Besbas, J
Wang, Y
He, P
Chen, M
Zhu, D
Wu, Y
Lee, J
Wang, L
Moon, J
Koirala, N
Oh, S
Yang, H
Year 2018
Journal name Nature Communications
Volume number 9
Issue number 1
Start page 1
End page 6
Total pages 6
Publisher Nature Publishing Group
Abstract Charge-to-spin conversion in various materials is the key for the fundamental understanding of spin-orbitronics and efficient magnetization manipulation. Here we report the direct spatial imaging of current-induced spin accumulation at the channel edges of Bi2Se3 and BiSbTeSe2 topological insulators as well as Pt by a scanning photovoltage microscope at room temperature. The spin polarization is along the out-of-plane direction with opposite signs for the two channel edges. The accumulated spin direction reverses sign upon changing the current direction and the detected spin signal shows a linear dependence on the magnitude of currents, indicating that our observed phenomena are current-induced effects. The spin Hall angle of Bi2Se3, BiSbTeSe2, and Pt is determined to be 0.0085, 0.0616, and 0.0085, respectively. Our results open up the possibility of optically detecting the current-induced spin accumulations, and thus point towards a better understanding of the interaction between spins and circularly polarized light.
Subject Electronic and Magnetic Properties of Condensed Matter; Superconductivity
DOI - identifier 10.1038/s41467-018-04939-6
Copyright notice © 2018 The Author(s). Creative Commons Attribution 4.0 International License
ISSN 2041-1723
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