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Title: Modulation of spin dynamics in 2D transition-metal dichalcogenide via strain-driven symmetry breaking
Authors: Liu, Tao
Xiang, Du
Ng, Hong Kuan
Han, Zichao
Hippalgaonkar, Kedar
Suwardi, Ady
Martin, Jens
Garaj, Slaven
Wu, Jing
Keywords: Engineering::Materials::Metallic materials
Issue Date: 2022
Source: Liu, T., Xiang, D., Ng, H. K., Han, Z., Hippalgaonkar, K., Suwardi, A., Martin, J., Garaj, S. & Wu, J. (2022). Modulation of spin dynamics in 2D transition-metal dichalcogenide via strain-driven symmetry breaking. Advanced Science, 9(20), 2200816-.
Project: A2084c170 
Journal: Advanced Science 
Abstract: Transition metal dichalcogenides (TMDs) possess intrinsic spin–orbit interaction (SOI) with high potential to be exploited for various quantum phenomena. SOI allows the manipulation of spin degree of freedom by controlling the carrier's orbital motion via mechanical strain. Here, strain modulated spin dynamics in bilayer MoS2 field-effect transistors (FETs) fabricated on crested substrates are demonstrated. Weak antilocalization (WAL) is observed at moderate carrier concentrations, indicating additional spin relaxation path caused by strain fields arising from substrate crests. The spin lifetime is found to be inversely proportional to the momentum relaxation time, which follows the Dyakonov–Perel spin relaxation mechanism. Moreover, the spin–orbit splitting is obtained as 37.5 ± 1.4 meV, an order of magnitude larger than the theoretical prediction for monolayer MoS2, suggesting the strain enhanced spin-lattice coupling. The work demonstrates strain engineering as a promising approach to manipulate spin degree of freedom toward new functional quantum devices.
ISSN: 2198-3844
DOI: 10.1002/advs.202200816
Schools: School of Materials Science and Engineering 
Organisations: Institute of Materials Research and Engineering, A*STAR 
Rights: © 2022 The Authors. Advanced Science published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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