Creating and probing wide-bandgap nanoribbon-like structures in a continuous metallic graphene sheet
arXiv:1512.06503 · doi:10.1103/PhysRevB.94.085419
Abstract
The light-like dispersion of graphene monolayer results in many novel electronic properties in it1, however, this gapless feature also limits the applications of graphene monolayer in digital electronics2. A rare working solution to generate a moderate bandgap in graphene monolayer is to cut it into one-dimensional (1D) nanometre-wide ribbons3-13. Here we show that a wide bandgap can be created in a unique 1D strained structure, i.e., graphene-nanoribbon-like (GNR-like) structure, of a continuous graphene sheet via strong interaction between graphene and the metal substrate, instead of cutting graphene monolayer. The GNR-like structures with width of only a few nanometers are observed in a continuous graphene sheet grown on Rh foil by using thermal strain engineering. Spatially-resolved scanning tunnelling spectroscopy revealed bandgap opening of a few hundreds meV in the GNR-like structure in an otherwise continuous metallic graphene sheet, directly demonstrating the realization of a metallic-semiconducting-metallic junction entirely in a graphene monolayer. We also show that it is possible to tailor the structure and electronic properties of the GNR-like structure by using scanning tunnelling microscope.
4 Figures in main text and 6 Figures in SI
References in corpus (14)
- The electronic properties of graphene
- Energy Band Gap Engineering of Graphene Nanoribbons
- Half-Metallic Graphene Nanoribbons
- Emergence of Superlattice Dirac Points in Graphene on Hexagonal Boron Nitride
- Tailoring the atomic structure of graphene nanoribbons by STM lithography
- Room temperature magnetic order on zigzag edges of narrow graphene nanoribbons
- Proximity-induced ferromagnetism in graphene revealed by anomalous Hall effect
- Breakdown of continuum mechanics for nanometer-wavelength rippling of graphene
- Direct imaging of topological edge states at a bilayer graphene domain wall
- Emergence of ferroelectricity and spin-valley properties in two-dimensional honeycomb binary compounds
- Creating One-dimensional Nanoscale Periodic Ripples in a Continuous Mosaic Graphene Monolayer
- Observation of Valley-polarized Landau Levels in Strained Graphene
- Energy gaps of atomically precise armchair graphene nanoribbons
- Detecting giant electron-hole asymmetry in graphene monolayer generated by strain and charged-defect scattering via Landau level spectroscopy