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Spin-orbit coupling (SOC) provides unique capabilities to control spin by moving electrons around or turn electron trajectories by rotating spin. Recently, van der Waals interactions with transition metal dichalcogenides was shown to induce strong SOCs in graphene, offering great promises to combine large experimental flexibility of graphene with unique tuning capabilities of the SOC. Here, we investigate both SOC-driven band splitting and electron dynamics in monolayer graphene on WSe2 by measuring ballistic transverse magnetic focusing (TMF) effect. We found the splitting in the first focusing peak whose evolution in charge density and magnetic field is well reproduced by calculations using the SOC strength of ~13 meV and its absence in the second peak due to interband scattering at the edge. Temperature dependence measurement shows the possible suppression of the electron-electron scattering in the system. Further, we found that Shubnikov–de Haas oscillations exhibit SOC strength of ~3.4 meV, suggesting that it probes different electron dynamics, calling for new theory. In addition to providing spectroscopic evidence of the spin-orbit-coupled bands, our study demonstrates the possibility to exploit various ballistic transport effects in graphene, such as TMF, Veselago lensing, and Fabry-Pérot interference, to control or detect spin by turning ballistic electron motion.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Spin-orbit coupling, graphene, WSe2

Date published: 2023-09-30

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Communications (ISSN: 20411723) vol. 14 issue. 1 6124

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41467-023-41826-1

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Updated at: 2025-02-11 12:30:30 +0900

Published on MDR: 2025-02-11 12:30:30 +0900