Graphene on Rh(111): Scanning tunneling and atomic force microscopies studies
Abstract
The electronic and crystallographic structure of the graphene/Rh(111) moiré lattice is studied via combination of density-functional theory calculations and scanning tunneling and atomic force microscopy (STM and AFM). Whereas the principal contrast between hills and valleys observed in STM does not depend on the sign of applied bias voltage, the contrast in atomically resolved AFM images strongly depends on the frequency shift of the oscillating AFM tip. The obtained results demonstrate the perspectives of application atomic force microscopy/spectroscopy for the probing of the chemical contrast at the surface.
- Publication:
-
Applied Physics Letters
- Pub Date:
- June 2012
- DOI:
- 10.1063/1.4729549
- Bibcode:
- 2012ApPhL.100x1606V
- Keywords:
-
- atomic force microscopy;
- crystal structure;
- density functional theory;
- electronic structure;
- graphene;
- interface states;
- interface structure;
- rhodium;
- scanning tunnelling microscopy;
- 73.20.At;
- 68.35.Ct;
- 71.20.-b;
- 71.15.Mb;
- 68.37.Ef;
- 68.37.Ps;
- Surface states band structure electron density of states;
- Interface structure and roughness;
- Electron density of states and band structure of crystalline solids;
- Density functional theory local density approximation gradient and other corrections;
- Scanning tunneling microscopy;
- Atomic force microscopy