Electrical detection of the flat-band dispersion in van der Waals field-effect structures.
Journal
Nature nanotechnology
ISSN: 1748-3395
Titre abrégé: Nat Nanotechnol
Pays: England
ID NLM: 101283273
Informations de publication
Date de publication:
Dec 2023
Dec 2023
Historique:
received:
18
01
2023
accepted:
17
07
2023
medline:
18
8
2023
pubmed:
18
8
2023
entrez:
17
8
2023
Statut:
ppublish
Résumé
Two-dimensional flat-band systems have recently attracted considerable interest due to the rich physics unveiled by emergent phenomena and correlated electronic states at van Hove singularities. However, the difficulties in electrically detecting the flat-band position in field-effect structures are slowing down the investigation of their properties. In this work, we use indium selenide (InSe) as a flat-band system due to a van Hove singularity at the valence-band edge in a few-layer form of the material without the requirement of a twist angle. We investigate tunnelling photocurrents in gated few-layer InSe structures and relate them to ambipolar transport and photoluminescence measurements. We observe an appearance of a sharp change in tunnelling mechanisms due to the presence of the van Hove singularity at the flat band. We further corroborate our findings by studying tunnelling currents as a reliable probe for the flat-band position up to room temperature. Our results create an alternative approach to studying flat-band systems in heterostructures of two-dimensional materials.
Identifiants
pubmed: 37591936
doi: 10.1038/s41565-023-01489-x
pii: 10.1038/s41565-023-01489-x
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1416-1422Subventions
Organisme : Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (Swiss National Science Foundation)
ID : 172543
Organisme : Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (Swiss National Science Foundation)
ID : 175822
Organisme : Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (Swiss National Science Foundation)
ID : 177007
Organisme : Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (Swiss National Science Foundation)
ID : 164015
Organisme : EC | EU Framework Programme for Research and Innovation H2020 | H2020 Euratom (H2020 Euratom Research and Training Programme 2014-2018)
ID : 956813
Organisme : MEXT | Japan Society for the Promotion of Science (JSPS)
ID : JPMXP0112101001
Organisme : MEXT | Japan Society for the Promotion of Science (JSPS)
ID : JP20H00354
Organisme : MEXT | Japan Society for the Promotion of Science (JSPS)
ID : JP19H05790
Informations de copyright
© 2023. The Author(s).
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