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Enhanced Spin-to-Charge Conversion Efficiency in Ultrathin Bi2Se3Observed by Spintronic Terahertz Spectroscopy

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Title
Enhanced Spin-to-Charge Conversion Efficiency in Ultrathin Bi2Se3Observed by Spintronic Terahertz Spectroscopy
Author(s)
Park, Hanbum; Jeong, Kwangsik; Maeng, Inhee; Kyung Ik Sim; Pathak, Sachin; Kim, Jonghoon; Hong, Seok-Bo; Jung, Taek Sun; Kang, Chul; Kim, Jae Hoon; Hong, Jongill; Cho, Mann-Ho
Publication Date
2021-05
Journal
ACS Applied Materials and Interfaces, v.13, no.19, pp.23153 - 23160
Publisher
American Chemical Society
Abstract
© 2021 American Chemical Society.Owing to their remarkable spin-charge conversion (SCC) efficiency, topological insulators (TIs) are the most attractive candidates for spin-orbit torque generators. The simple method of enhancing SCC efficiency is to reduce the thickness of TI films to minimize the trivial bulk contribution. However, when the thickness reaches the ultrathin regime, the SCC efficiency decreases owing to intersurface hybridization. To overcome these contrary effects, we induced dehybridization of the ultrathin TI film by breaking the inversion symmetry between surfaces. For the TI film grown on an oxygen-deficient transition-metal oxide, the unbonded transition-metal d-orbitals affected only the bottom surface, resulting in asymmetric surface band structures. Spintronic terahertz emission spectroscopy, an emerging tool for investigating the SCC characteristics, revealed that the resulting SCC efficiency in symmetry-broken ultrathin Bi2Se3 was enhanced by up to ∼2.4 times.
URI
https://pr.ibs.re.kr/handle/8788114/9920
DOI
10.1021/acsami.1c03168
ISSN
1944-8244
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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