Experimental observation of spin−split energy dispersion in high-mobility single-layer graphene/WSe2 heterostructures

Priya Tiwari; Mohit Kumar Jat; Adithi Udupa; Deepa S. Narang; Kenji Watanabe; Takashi Taniguchi; Diptiman Sen; Aveek Bid

doi:10.1038/s41699-022-00348-y

Journal article Experimental observation of spin−split energy dispersion in high-mobility single-layer graphene/WSe2 heterostructures

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Priya Tiwari, Mohit Kumar Jat, Adithi Udupa, Deepa S. Narang, Kenji Watanabe, Takashi Taniguchi, Diptiman Sen, Aveek Bid. Experimental observation of spin−split energy dispersion in high-mobility single-layer graphene/WSe2 heterostructures. npj 2D Materials and Applications. 2022, 6 (1), 68. https://doi.org/10.1038/s41699-022-00348-y

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We report the experimental determination of the band structure of single-layer graphene in the presence of strong proximity induced spin-orbit coupling. We achieve this in high-mobility hBN-encapsulated single-layer graphene and WSe2 heterostructures by measurements of quantum oscillations. We observe clear spin-splitting of the graphene bands along with a substantial increase in the Fermi velocity. Using a theoretical model with realistic parameters to fit our experimental data, we uncover confirmation of a bandgap opening and band inversion in the single-layer graphene. Further, we establish that the deviation of the low-energy band structure from pristine single-layer graphene is determined primarily by the valley-Zeeman SOC and Rashba SOC, with the Kane-Mele SOC being inconsequential. Despite the robust theoretical predictions and observations of band-splitting, a quantitative measure of the spin splitting of the valence and the conduction bands and the consequent low-energy dispersion relation in single-layer graphene was lacking. Our combined experimental and theoretical study fills this lacuna.

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Creative Commons BY Attribution 4.0 International

Keyword: Spin-orbit coupling, graphene, band structure

Date published: 2022-10-08

Publisher: Springer Science and Business Media LLC

Journal:

npj 2D Materials and Applications (ISSN: 23977132) vol. 6 issue. 1 68

Funding:

Department of Science and Technology, Ministry of Science and Technology DST/SJF/PSA01/2016-17
Department of Science and Technology, Ministry of Science and Technology JBR/2020/000043
MEXT | JST | Accelerated Innovation Research Initiative Turning Top Science and Ideas into High-Impact Values JPMXP0112101001

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

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First published URL: https://doi.org/10.1038/s41699-022-00348-y

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Updated at: 2025-02-28 08:31:01 +0900

Published on MDR: 2025-02-28 08:31:01 +0900

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