2009/11/20 by H. G. Zhang, H G Zhang, H Hu +15 · 37 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Carbon Nanotubes in Composites #Conductance #Graphene #Graphene nanoribbons #Graphene research and applications #Quantum dot #Quantum tunnelling #Scanning tunneling microscope #Scanning tunneling spectroscopy #Spectral line #Spectroscopy #cond-mat.mtrl-sci
paper · pdf · doi:10.1088/0953-8984/22/30/302001
published in Journal of Physics Condensed Matter 22(30), 302001 (IOP Publishing) · 17pages, 4figures, 1table
arxiv created 2009/11/20 · openalex publication_date 2010/07/02 · arxiv updated 2010/07/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Laterally localized electronic states are identified on a single layer of graphene on ruthenium by low temperature scanning tunneling spectroscopy (STS). The individual states are separated by 3 nm and comprise regions of about 90 carbon atoms. This constitutes a highly regular quantum dot-array with molecular precision. It is evidenced by quantum well resonances (QWRs) with energies that relate to the corrugation of the graphene layer. The dI/dV conductance spectra are modeled by a layer height dependent potential-well with a delta-function potential that describes the barrier for electron penetration into graphene. The resulting QWRs are strongest and lowest in energy on the isolated 'hill' regions with a diameter of 2 nm, where the graphene is decoupled from the surface.