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Pré-Publication, Document De Travail (Preprint/Prepublication) Année : 2024

Two-dimensional to bulk crossover of the WSe2 electronic band structure

Résumé

Transition Metal Dichalcogenides (TMD) are layered materials obtained by stacking two-dimensional sheets weakly bonded by van der Waals interactions. In bulk TMD, band dispersions are observed in the direction normal to the sheet plane (z-direction) due to the hybridization of out-of-plane orbitals but no kz-dispersion is expected at the single-layer limit. Using angle-resolved photoemission spectroscopy, we precisely address the two-dimensional to three-dimensional crossover of the electronic band structure of epitaxial WSe2 thin films. Increasing number of discrete electronic states appears in given kz-ranges while increasing the number of layers. The continuous bulk dispersion is nearly retrieved for 6-sheet films. These results are reproduced by calculations going from a relatively simple tight-binding model to a sophisticated KKR-Green's function calculation. This two-dimensional system is hence used as a benchmark to compare different theoretical approaches.
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Dates et versions

hal-04632357 , version 1 (03-07-2024)

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  • HAL Id : hal-04632357 , version 1

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Patrick Le Fèvre, Raphaël Salazar, Matthieu Jamet, François Bertran, Chiara Bigi, et al.. Two-dimensional to bulk crossover of the WSe2 electronic band structure. 2024. ⟨hal-04632357⟩
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