Giant moiré patterns and lattice-matched epitaxial graphene grown
Diez Albar, Juan
Cheng, Tin s.
MetadataShow full item record
DescriptionLattice-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.
- 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
- University of Nottingham, UK Campus::Faculty of Science::School of Chemistry
- University of Nottingham, UK Campus::Faculty of Science::School of Physics and Astronomy
Data typeScanning Probe Microscopy Images, Raman spectra
- 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
- Engineering & Physical Sciences Research Council
- Leverhulme Trust
Data collection methodAsylum Cypher Atomic Force Microscope, Horiba LABRAM Raman microscope