Giant moiré patterns and lattice-matched epitaxial graphene grown
Publication date
2018-01-01Creators
Summerfield, Alex
Davies, Andrew
Beton, Peter
Diez Albar, Juan
Thomas, James
Cheng, Tin s.
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Show full item recordDescription
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 coexists
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 uniform isotropic strain, while the giant moiré patterns result in complex
splitting of Raman peaks due to strain variations across the moiré unit cell. The latticematched
graphene has a lower conductance than both the Frenkel-Kontorova-type
dislocation lines, and also the topological defects where they terminate. We relate these
results to theoretical models of band-gap formation in graphene/boron nitride
heterostructures.
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Related publication DOI
Subjects
- Epitaxy, Graphene -- Mechanical properties, Strains and stresses, Raman, AFM
- Physical sciences::Chemistry::Physical chemistry
- Physical sciences::Physics::Chemical physics, Solid-state physics
- Physical sciences::Materials science
- Q Science::QC Physics::QC170 Atomic physics. Constitution and properties of matter
- Q Science::QD Chemistry::QD450 Physical and theoretical chemistry
Divisions
- University of Nottingham, UK Campus::Faculty of Science::School of Chemistry
- University of Nottingham, UK Campus::Faculty of Science::School of Physics and Astronomy
Deposit date
2017-12-19Data type
Scanning Probe Microscopy Images, Raman spectraContributors
- Cheng, Tin s.
- Korolkov, Vladimir V.
- Goodey, Nathan L.
- Mellor, Christopher J.
- Watanabe, Kenji
- Khlobystov, Andrei N.
- Taniguchi, Takashi
- Foxon, C. Thomas
- Eaves, Laurence
- Novikov, Sergei V.
- Stapleton, Emily
Funders
- Engineering & Physical Sciences Research Council
- Leverhulme Trust
Data collection method
Asylum Cypher Atomic Force Microscope, Horiba LABRAM Raman microscopeResource languages
- en