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Ghost anti-crossings caused by interlayer umklapp hybridization of bands in 2D heterostructures
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Graham, Abigail J., Zultak, Johanna, Hamer, Matthew J., Zolyomi, Viktor, Magorrian, Samuel, Barinov, Alexei, Kandyba, Viktor, Giampietri, Alessio, Locatelli, Andrea, Genuzio, Francesca, Teutsch, Natalie C., Salazar, Cuauhtémoc, Hine, Nicholas, Fal’ko, Vladimir I., Gorbachev, Roman V. and Wilson, Neil R. (2020) Ghost anti-crossings caused by interlayer umklapp hybridization of bands in 2D heterostructures. 2D Materials, 8 (1). 015016. doi:10.1088/2053-1583/abc13e
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WRAP-Ghost-anti-crossings-interlayer-umklapp-2D-heterostructures-Graham-2020.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (1325Kb) | Preview |
Official URL: https://doi.org/10.1088/2053-1583/abc13e
Abstract
In two-dimensional heterostructures, crystalline atomic layers with differing lattice parameters can stack directly one on another. The resultant close proximity of atomic lattices with differing periodicity can lead to new phenomena. For umklapp processes, this opens the possibility for interlayer umklapp scattering, where interactions are mediated by the transfer of momenta to or from the lattice in the neighbouring layer. Using angle-resolved photoemission spectroscopy to study a graphene on InSe heterostructure, we present evidence that interlayer umklapp processes can cause hybridization between bands from neighbouring layers in regions of the Brillouin zone where bands from only one layer are expected, despite no evidence for Moiré-induced replica bands. This phenomenon manifests itself as ‘ghost’ anti-crossings in the InSe electronic dispersion. Applied to a range of suitable two-dimensional material pairs, this phenomenon of interlayer umklapp hybridization can be used to create strong mixing of their electronic states, giving a new tool for twist-controlled band structure engineering.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||||||||
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| Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of Science > Physics | ||||||||||||||||||||||||||||||||||||||||||
| SWORD Depositor: | Library Publications Router | ||||||||||||||||||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Heterostructures , Lattice theory, Solid state physics., Nanostructured materials, Photoelectron spectroscopy, Photoemission | ||||||||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | 2D Materials | ||||||||||||||||||||||||||||||||||||||||||
| Publisher: | IOP Publishing | ||||||||||||||||||||||||||||||||||||||||||
| ISSN: | 2053-1583 | ||||||||||||||||||||||||||||||||||||||||||
| Official Date: | 30 October 2020 | ||||||||||||||||||||||||||||||||||||||||||
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| Volume: | 8 | ||||||||||||||||||||||||||||||||||||||||||
| Number: | 1 | ||||||||||||||||||||||||||||||||||||||||||
| Article Number: | 015016 | ||||||||||||||||||||||||||||||||||||||||||
| DOI: | 10.1088/2053-1583/abc13e | ||||||||||||||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||||||||||||||||||||
| Publisher Statement: | |||||||||||||||||||||||||||||||||||||||||||
| Access rights to Published version: | Open Access | ||||||||||||||||||||||||||||||||||||||||||
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