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Strain-Engineered Graphene Grown on Hexagonal Boron Nitride by Molecular Beam Epitaxy

Summerfield, Alex; Davies, Andrew; Cheng, Tin S.; Korolkov, Vladimir V.; Cho, YongJin; Mellor, Christopher J.; Foxon, C. Thomas; Khlobystov, Andrei N.; Watanabe, Kenji; Taniguchi, Takashi; Eaves, Laurence; Novikov, Sergei V.; Beton, Peter H.

Authors

Alex Summerfield

Andrew Davies

Vladimir V. Korolkov

YongJin Cho

C. Thomas Foxon

Kenji Watanabe

Takashi Taniguchi



Abstract

Graphene grown by high temperature molecular beam epitaxy on hexagonal boron nitride (hBN) forms continuous domains with dimensions of order 20 μm, and exhibits moiré patterns with large periodicities, up to ~30 nm, indicating that the layers are highly strained. Topological defects in the moiré patterns are observed and attributed to the relaxation of graphene islands which nucleate at different sites and subsequently coalesce. In addition, cracks are formed leading to strain relaxation, highly anisotropic strain fields, and abrupt boundaries between regions with different moiré periods. These cracks can also be formed by modification of the layers with a local probe resulting in the contraction and physical displacement of graphene layers. The Raman spectra of regions with a large moiré period reveal split and shifted G and 2D peaks confirming the presence of strain. Our work demonstrates a new approach to the growth of epitaxial graphene and a means of generating and modifying strain in graphene.

Citation

Summerfield, A., Davies, A., Cheng, T. S., Korolkov, V. V., Cho, Y., Mellor, C. J., …Beton, P. H. (2016). Strain-Engineered Graphene Grown on Hexagonal Boron Nitride by Molecular Beam Epitaxy. Scientific Reports, 6(1), Article 22440. https://doi.org/10.1038/srep22440

Journal Article Type Article
Acceptance Date Feb 15, 2016
Online Publication Date Mar 1, 2016
Publication Date 2016-04
Deposit Date Jul 7, 2016
Publicly Available Date Jul 7, 2016
Journal Scientific Reports
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 6
Issue 1
Article Number 22440
DOI https://doi.org/10.1038/srep22440
Public URL https://nottingham-repository.worktribe.com/output/774546
Publisher URL http://www.nature.com/articles/srep22440

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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