Moiré-modulated conductance of hexagonal boron nitride tunnel barriers
Publication Date
July 16, 2018
Creators
Description
Monolayer hexagonal boron nitride (hBN) tunnel barriers investigated using conductive atomic force microscopy reveal moiré patterns in the spatial maps of their tunnel conductance consistent with the formation of a moiré superlattice between the hBN and an underlying highly ordered pyrolytic graphite (HOPG) substrate. This variation is attributed to a periodic modulation of the local density of states and occurs for both exfoliated hBN barriers and epitaxially-grown layers. The epitaxial barriers also exhibit enhanced conductance at localised sub-nanometre regions which are attributed to exposure of the substrate to a nitrogen plasma source during the high temperature growth process. Our results show clearly a spatial periodicity of tunnel current due to the formation of a moiré superlattice and we argue that this can provide a mechanism for elastic scattering of charge carriers for similar interfaces embedded in graphene/hBN resonant tunnel diodes.
Collection dates:
2016-2018
Associate publ. DOI
Subjects
Subjects (JACS)
Subjects (LC)
Divisions
University of Nottingham, UK Campus::Faculty of Science::School of Physics and Astronomy
Data type
Imaging data
Funders
Leverhulme Trust
EU Graphene Flagship
European Research Council
The Royal Society
US Army Research Office
MEXT Japan
CREST
Grant Number
EP/L013908/1
EP/P019080/1
EP/M50810X/1
RPG-2014-129
W911NF-16-1-0279
JPMJCR15F3
Data collection method
Instruments: Asylum Research Cypher-S AFM/STM
Resource languages
English
Publisher
The University of Nottingham
Date Issued
July 16, 2018
File(s)![Thumbnail Image]()
Name
Research Data.zip
Description
Collection of raw AFM data in .ibw format and optical images of samples/devices used in all figures of paper (.zip archive)
Size
135.87 MB
Format
Unknown
Checksum (MD5)
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