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Article Dans Une Revue Physical Review B Année : 2018

Electronic band structure of Two-Dimensional WS 2 /Graphene van der Waals Heterostructures

Mathieu G Silly
Patrick Le Fevre
Julien Rault
Matteo Calandra

Résumé

Combining single-layer two-dimensional semiconducting transition-metal dichalcogenides (TMDs) with a graphene layer in van der Waals heterostructures offers an intriguing means of controlling the electronic properties through these heterostructures. Here, we report the electronic and structural properties of transferred single-layer WS2 on epitaxial graphene using micro-Raman spectroscopy, angle-resolved photoemission spectroscopy measurements, and density functional theory (DFT) calculations. The results show good electronic properties as well as a well-defined band arising from the strong splitting of the single-layer WS2 valence band at the K points, with a maximum splitting of 0.44 eV. By comparing our DFT results with local and hybrid functionals, we find the top valence band of the experimental heterostructure is close to the calculations for suspended single-layer WS2. Our results provide an important reference for future studies of electronic properties of WS2 and its applications in valleytronic devices.
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Dates et versions

hal-01772263 , version 1 (07-10-2020)

Identifiants

Citer

Hugo Henck, Zeineb Ben Aziza, Debora Pierucci, Feriel Laourine, Francesco Reale, et al.. Electronic band structure of Two-Dimensional WS 2 /Graphene van der Waals Heterostructures. Physical Review B, 2018, 97 (15), pp.155421. ⟨10.1103/PhysRevB.97.155421⟩. ⟨hal-01772263⟩
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