Electric-Field-Tunable Spin–Orbit Gap in a Bilayer Graphene/WSe<sub>2</sub> Quantum Dot
We report on the investigation of proximity-induced spin-orbit coupling (SOC) in a heterostructure of bilayer graphene (BLG) and tungsten diselenide (WSe<sub>2</sub>). 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 <i>g</i> factor at larger displacement fields, consistent with weaker lateral confinement of the QD. Our findings show evidence of the influence of WSe<sub>2</sub> across BLG layers, driven by reduced real-space confinement and increased layer localization of the QD states on the BLG layer distant to the WSe<sub>2</sub> at higher displacement fields. This study demonstrates the electrostatic tunability of the spin-orbit gap in BLG/WSe<sub>2</sub> heterostructures, which is especially relevant for the field of spintronics and future spin qubit control in BLG QDs.
Authors
- Christoph Stampfer (ORCID: https://orcid.org/0000-0002-4958-7362)
- Leonard Müller (ORCID: https://orcid.org/0000-0002-7331-3804)
- S. Möller (ORCID: https://orcid.org/0000-0002-6237-6762)
- Eike Icking (ORCID: https://orcid.org/0000-0002-6923-0854)
- Takashi Taniguchi (ORCID: https://orcid.org/0000-0002-1467-3105)
- Kenji Watanabe (ORCID: https://orcid.org/0000-0003-3701-8119)
- Daniel J. Emmerich (ORCID: https://orcid.org/0000-0003-4582-9851)
- K. Hecker (ORCID: https://orcid.org/0000-0002-7398-8131)
- Christian Volk (ORCID: https://orcid.org/0000-0002-9527-317X)
- H. Dulisch
Institutions
- Forschungszentrum Jülich (DE)
- National Institute for Materials Science (JP)
- Grunberger Diabetes Institute (US)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- RWTH Aachen University (DE)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-06-19
- DOI
- https://doi.org/10.1021/acs.nanolett.5c02229
- Citations
- 1
- Primary Topic
- Graphene research and applications
- Type
- article
- Field-Weighted Citation Impact
- 0.52
Funders
- Deutsche Forschungsgemeinschaft
- Ministry of Education, Culture, Sports, Science and Technology
- European Research Council
- Japan Society for the Promotion of Science
- Core Research for Evolutional Science and Technology