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We report on the investigation of proximity-induced spin–orbit coupling (SOC) in a heterostructure of bilayer graphene (BLG) and tungsten diselenide (WSe2). A BLG quantum dot (QD) in the few-particle regime acts as a sensitive probe for induced SOC. Finite bias and magnetotransport spectroscopy measurements reveal a significantly enhanced SOC that decreases with the applied displacement field, distinguishing it from pristine BLG. Furthermore, our measurements demonstrate a reduced valley g factor at larger displacement fields, consistent with weaker lateral confinement of the QD. Our findings show evidence of the influence of WSe2 across BLG layers, driven by reduced real-space confinement and increased layer localization of the QD states on the BLG layer distant to the WSe2 at higher displacement fields. This study demonstrates the electrostatic tunability of the spin–orbit gap in BLG/WSe2 heterostructures, which is especially relevant for the field of spintronics and future spin qubit control in BLG QDs.

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• In Copyright
  

  This document is the Accepted Manuscript version of a Published Article that appeared in final form in Nano Letters, copyright © 2025 American Chemical Society. To access the final published article, see https://doi.org/10.1021/acs.nanolett.5c02229.

Keyword: Spin-orbit coupling, Graphene heterostructure, Spin qubit

Date published: 2025-07-02

Publisher: American Chemical Society (ACS)

Journal:

• Nano Letters (ISSN: 15306984) vol. 25 issue. 26 p. 10549-10555

Funding:

• European Research Council 820254
• Ministry of Education, Culture, Sports, Science and Technology
• Deutsche Forschungsgemeinschaft 535377524
• Deutsche Forschungsgemeinschaft EXC 2004/1 - 390534769
• Core Research for Evolutional Science and Technology JPMJCR24A5
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052

Manuscript type: Author's version (Accepted manuscript)

MDR DOI:

First published URL: https://doi.org/10.1021/acs.nanolett.5c02229

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Updated at: 2026-06-26 17:05:35 +0900

Published on MDR: 2026-06-26 18:28:48 +0900