Phark, S.-H., Borme, J., Leon Vanegas, A. A., Corbetta, M., Sander, D., Kirschner, J.
Scanning tunneling spectroscopy of epitaxial graphene nanoisland on Ir(111)
Nanoscale Research Letters 7, (1),pp 255/0-3 (2012)
Scanning tunneling spectroscopy (STS) was used to measure local differential conductance (dI/dV) spectra on nanometer-size graphene islands on an Ir(111) surface. Energy resolved dI/dV maps clearly show a spatial modulation, which we ascribe to a modulated local density of states due to quantum confinement. STS near graphene edges indicates a position dependence of the dI/dV signals, which suggests a reduced density of states near the edges of graphene islands on Ir(111).