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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Summerfield A,Davies A,Cheng TS,Korolkov VV,Cho Y,Mellor CJ,Foxon CT,Khlobystov AN,Watanabe K,Taniguchi T,Eaves L,Novikov SV,Beton PHdoi
10.1038/srep22440subject
Has Abstractpub_date
2016-03-01 00:00:00pages
22440issn
2045-2322pii
srep22440journal_volume
6pub_type
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