Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe2

Qing Rao, Wun-Hao Kang, Hongxia Xue, Ziqing Ye, Xuemeng Feng, Kenji Watanabe, Takashi Taniguchi, Ning Wang, Ming-Hao Liu () and Dong-Keun Ki ()
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Qing Rao: The University of Hong Kong
Wun-Hao Kang: National Cheng Kung University
Hongxia Xue: The University of Hong Kong
Ziqing Ye: The Hong Kong University of Science and Technology
Xuemeng Feng: The Hong Kong University of Science and Technology
Kenji Watanabe: Research Center for Electronic and Optical Materials, National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Ning Wang: The Hong Kong University of Science and Technology
Ming-Hao Liu: National Cheng Kung University
Dong-Keun Ki: The University of Hong Kong

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Van der Waals interactions with transition metal dichalcogenides were shown to induce strong spin-orbit coupling (SOC) in graphene, offering great promises to combine large experimental flexibility of graphene with unique tuning capabilities of the SOC. Here, we probe SOC-driven band splitting and electron dynamics in graphene on WSe2 by measuring ballistic transverse magnetic focusing. We found a clear 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 no splitting in the second peak that indicates stronger Rashba SOC. Possible suppression of electron-electron scatterings was found in temperature dependence measurement. Further, we found that Shubnikov-de Haas oscillations exhibit a weaker band splitting, suggesting that it probes different electron dynamics, calling for a new theory. Our study demonstrates an interesting possibility to exploit ballistic electron motion pronounced in graphene for emerging spin-orbitronics.

Date: 2023
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DOI: 10.1038/s41467-023-41826-1

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