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Moiré-Modulated Conductance of Hexagonal Boron Nitride Tunnel Barriers

Lookup NU author(s): Dr Aleksey KozikovORCiD

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Abstract

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 periodc 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 localized subnanometer 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.

Publication metadata

Author(s): Summerfield A, Kozikov A, Cheng TS, Davies A, Cho Y, Khlobystov AN, Mellor CJ, Foxon CT, Watanabe K, Taniguchi T, Eaves L, Novoselov K, Novikov SV, Beton PH

Publication type: Article

Publication status: Published

Journal: Nano Letters

Year: 2018

Volume: 18

Pages: 4241-4246

Print publication date: 11/07/2018

Online publication date: 18/06/2018

Acceptance date: 15/06/2018

Date deposited: 19/06/2020

ISSN (print): 1530-6984

ISSN (electronic): 1530-6992

Publisher: American Chemical Society

URL: https://doi.org/10.1021/acs.nanolett.8b01223

DOI: 10.1021/acs.nanolett.8b01223

PubMed id: 29913062

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