1. Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe2.
- Author
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Rao, Qing, Kang, Wun-Hao, Xue, Hongxia, Ye, Ziqing, Feng, Xuemeng, Watanabe, Kenji, Taniguchi, Takashi, Wang, Ning, Liu, Ming-Hao, and Ki, Dong-Keun
- Subjects
BALLISTIC conduction ,GRAPHENE ,TRANSITION metals ,MONOMOLECULAR films ,ELECTRON scattering ,SPIN-orbit interactions - 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 WSe
2 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. By combining graphene with transition metal dichalcogenides, such as WSe2, it is possible to induce a large spin-orbit interaction in the graphene layer. Here, Rao et al study the spin-orbit coupling in graphene/WSe2 heterostructures using the ballistic transport based technique, known transverse magnetic focusing. [ABSTRACT FROM AUTHOR]- Published
- 2023
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