Two-dimensional to bulk crossover of the WSe2 electronic band structure
Year: 2025
Type: article
Abstract: Transition metal dichalcogenides (TMDs) 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 large area 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.
Source: Electronic Structure
Institutions: Synchrotron SOLEIL, University of West Bohemia in Pilsen, Institut polytechnique de Grenoble, Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Spintronique et Technologie des Composants, Université Paris-Saclay, Centre de Nanosciences et de Nanotechnologies, Institut de Physique de Rennes, Université de Rennes, ABB (Switzerland)
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,325
Funder: Agence Nationale de la Recherche
OpenAlex ID: W4410635511