Spin-orbit proximity in MoS2/bilayer graphene heterostructures
Van der Waals heterostructures provide a versatile platform for tailoring electronic properties through the integration of two-dimensional materials. Among these combinations, the interaction between bilayer graphene and transition metal dichalcogenides (TMDs) stands out due to its potential for inducing spin-orbit coupling (SOC) in graphene. Future devices concepts require the understanding of the precise nature of SOC in TMD/bilayer graphene heterostructures and its influence on electronic transport phenomena. Here, we experimentally confirm the presence of two distinct types of SOC - Ising (Δ<sub>I</sub> = 1.55 meV) and Rashba (Δ<sub>R</sub> = 2.5 meV) - in bilayer graphene when interfaced with molybdenum disulfide. Furthermore, we reveal a non-monotonic trend in conductivity with respect to the electric displacement field at charge neutrality. This phenomenon is ascribed to the existence of single-particle gaps induced by the Ising SOC, which can be closed by a critical displacement field. Our findings also unveil sharp peaks in the magnetoconductivity around the critical displacement field, challenging existing theoretical models.
Authors
- Hadrien Duprez (ORCID: https://orcid.org/0000-0003-0506-126X)
- Leonid Levitov (ORCID: https://orcid.org/0000-0002-4268-731X)
- Archisman Panigrahi (ORCID: https://orcid.org/0000-0003-2619-431X)
- Munazza Gull
- Takashi Taniguchi (ORCID: https://orcid.org/0000-0002-1467-3105)
- Kenji Watanabe (ORCID: https://orcid.org/0000-0003-3701-8119)
- Thomas Ihn (ORCID: https://orcid.org/0000-0002-5587-6953)
- Chuyao Tong (ORCID: https://orcid.org/0000-0003-4947-6002)
- Michele Masseroni (ORCID: https://orcid.org/0000-0003-1663-8239)
- K. Ensslin (ORCID: https://orcid.org/0000-0001-7007-6949)
- Jonas D. Gerber (ORCID: https://orcid.org/0000-0002-4164-8765)
- Markus Niese
- Felix Fischer (ORCID: https://orcid.org/0009-0007-7166-3222)
- Nils Jacobsen
Institutions
- National Institute for Materials Science (JP)
- ETH Zurich (CH)
- Massachusetts Institute of Technology (US)
- University of Göttingen (DE)
Publication Details
- Journal
- Nature Communications
- Published
- 2024-10-26
- DOI
- https://doi.org/10.1038/s41467-024-53324-z
- Citations
- 24
- Primary Topic
- Graphene research and applications
- Type
- article
- Field-Weighted Citation Impact
- 2.81
Funders
- National Science Foundation
- Graphene Flagship
- Ministry of Education, Culture, Sports, Science and Technology
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Horizon 2020 Framework Programme
- Japan Society for the Promotion of Science
- H2020 European Research Council