Spin-orbit proximity in MoS2/bilayer graphene heterostructures

Michele Masseroni (), Mario Gull, Archisman Panigrahi, Nils Jacobsen, Felix Fischer, Chuyao Tong, Jonas D. Gerber, Markus Niese, Takashi Taniguchi, Kenji Watanabe, Leonid Levitov, Thomas Ihn, Klaus Ensslin () and Hadrien Duprez
Additional contact information
Michele Masseroni: ETH Zürich
Mario Gull: ETH Zürich
Archisman Panigrahi: Massachusetts Institute of Technology
Nils Jacobsen: University of Göttingen
Felix Fischer: ETH Zürich
Chuyao Tong: ETH Zürich
Jonas D. Gerber: ETH Zürich
Markus Niese: ETH Zürich
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
Leonid Levitov: Massachusetts Institute of Technology
Thomas Ihn: ETH Zürich
Klaus Ensslin: ETH Zürich
Hadrien Duprez: ETH Zürich

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract 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 (ΔI = 1.55 meV) and Rashba (ΔR = 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.

Date: 2024
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DOI: 10.1038/s41467-024-53324-z

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