Article 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 SAMURAI ORCID (National Institute for Materials ScienceROR) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials ScienceROR) ; Diptiman Sen ; Aveek Bid

s41699-022-00348-y.pdf
Download file (1.26 MB)
Download as zip (960 KB)
Collection

Citation
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
SAMURAI

Description:

(abstract)

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.

Rights:

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)

MDR DOI:

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

Related item:

Other identifier(s):

Contact agent:

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

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

Filename Size
Filename s41699-022-00348-y.pdf (Thumbnail)
application/pdf 		Size 1.26 MB Detail