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説明:

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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Spin-orbit coupling, graphene, band structure

刊行年月日: 2022-10-08

出版者: Springer Science and Business Media LLC

掲載誌:

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

研究助成金:

• 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

原稿種別: 出版者版 (Version of record)

MDR DOI:

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

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更新時刻: 2025-02-28 08:31:01 +0900

MDRでの公開時刻: 2025-02-28 08:31:01 +0900