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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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Official URL: https://doi.org/10.1088/2053-1583/abc13e

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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
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
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
Dates:
DateEvent
30 October 2020Published
14 October 2020Accepted
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
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/N509565/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/P01139X/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/N010345/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/L01548X/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
CDT GrapheneNOWNA[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
Doctoral Prize Fellowship[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
European Graphene Flagship ProjectEuropean Commissionhttp://dx.doi.org/10.13039/501100000780
RC Synergy Grant Hetero2DEuropean Research Councilhttp://dx.doi.org/10.13039/501100000781
ARCHER National UK Supercomputer RAP Project [EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
URFRoyal Societyhttp://dx.doi.org/10.13039/501100000288
Nanotechnology grantLloyd's Register Foundationhttp://dx.doi.org/10.13039/100008885
EP/P020232[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
7308Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
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