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Direct observation of spin accumulation and spin-orbit torque driven by Rashba-Edelstein effect in an InAs quantum-well layer

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Title
Direct observation of spin accumulation and spin-orbit torque driven by Rashba-Edelstein effect in an InAs quantum-well layer
Author(s)
Lee, Won-Bin; Kim, Seong Been; Kim, Kyoung-Whan; Lee, Kyung-Jin; Koo, Hyun Cheol; Gyung-Min Choi
Publication Date
2021-11-08
Journal
Physical Review B, v.104, no.18
Publisher
American Physical Society
Abstract
© 2021 American Physical Society.For semiconductor spintronics, efficient spin generation in semiconductor and spin transfer to ferromagnetic metal (FM) are essentially required. Two-dimensional electron gas (2DEG) of semiconductor quantum wells is a promising system for generating spin via the Rashba-Edelstein effect (REE) because of its strong inversion symmetry breaking. In this study, we investigate spin accumulation through REE and spin Hall effect (SHE) in the 2DEG of an InAs quantum well. We use spatial- and polarization-resolved measurements of spin, which reveals that REE dominates SHE in 2DEG. Furthermore, REE in 2DEG induces a spin-orbit torque on FM in a 2DEG/insulator/FM heterostructure. Using direction- and time-resolved measurements of FM magnetization, we determine a sizeable fieldlike torque, which is attributed to the phonon-mediated spin transport from 2DEG to FM.
URI
https://pr.ibs.re.kr/handle/8788114/10989
DOI
10.1103/PhysRevB.104.184412
ISSN
2469-9950
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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