Lattice-matched epitaxial graphene grown on boron nitride

Davies, Andrew, Albar, J.D., Summerfield, Alex, Thomas, James C., Cheng, Tin S., Korolkov, Vladimir V., Stapleton, Emily, Wrigley, James, Goodey, Nathan L., Mellor, Christopher J., Khlobystov, Andrei N., Watanabe, Kenji, Taniguchi, Takashi, Foxon, C.T., Eaves, Laurence, Novikov, Sergei V. and Beton, Peter H. (2018) Lattice-matched epitaxial graphene grown on boron nitride. Nano Letters, 18 (1). pp. 498-504. ISSN 1530-6992

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Lattice-matched graphene on hexagonal boron nitride is expected to lead to the formation of a band-gap but requires the formation of highly strained material and has not hitherto been realised. We demonstrate that aligned, lattice-matched graphene can be grown by molecular beam epitaxy using substrate temperatures in the range 1600-1710 °C and co-exists with a topologically-modified moiré pattern, and with regions of strained graphene which have giant moiré periods up to ~80 nm. Raman spectra reveal narrow red-shifted peaks due to isotropic strain, while the giant moiré patterns result in complex splitting of Raman peaks due to strain variations across the moiré unit cell. The lattice-matched graphene has a lower conductance than both the Frenkel-Kontorova-type domain walls, and also the topological defects where they terminate. We relate these results to theoretical models of band-gap formation in graphene/boron nitride heterostructures.

Item Type: Article
Keywords: graphene; boron nitride; growth; strain; band-gap; epitaxy
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Chemistry
University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
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Depositing User: Eprints, Support
Date Deposited: 14 Dec 2017 13:47
Last Modified: 04 May 2020 19:26

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