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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.03768 |
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| _version_ | 1866916313220251648 |
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| author | Fèvre, Patrick Le Salazar, Raphaël Jamet, Matthieu Bertran, François Bigi, Chiara Ourghi, Abdelkarim Vergnaud, Céline Pulkkinen, Aki Minar, Jan Jaouen, Thomas Rault, Julien |
| author_facet | Fèvre, Patrick Le Salazar, Raphaël Jamet, Matthieu Bertran, François Bigi, Chiara Ourghi, Abdelkarim Vergnaud, Céline Pulkkinen, Aki Minar, Jan Jaouen, Thomas Rault, Julien |
| contents | 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 WSe$_2$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_03768 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Two-dimensional to bulk crossover of the WSe$_2$ electronic band structure Fèvre, Patrick Le Salazar, Raphaël Jamet, Matthieu Bertran, François Bigi, Chiara Ourghi, Abdelkarim Vergnaud, Céline Pulkkinen, Aki Minar, Jan Jaouen, Thomas Rault, Julien Materials Science 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 WSe$_2$ 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. |
| title | Two-dimensional to bulk crossover of the WSe$_2$ electronic band structure |
| topic | Materials Science |
| url | https://arxiv.org/abs/2407.03768 |