DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2011 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

O: Fachverband Oberflächenphysik

O 98: Graphene VI

O 98.6: Talk

Friday, March 18, 2011, 12:30–12:45, WIL A317

Scanning tunneling spectroscopy of confined states within graphene nanoislands — •Christian Pauly1, Dinesh Subramaniam1, Viktor Geringer1, Rafael Reiter2, Marco Pratzer1, Marcus Liebmann1, Carsten Busse3, Florian Libisch2, Thomas Michely3, and Markus Morgenstern11II. Physikalisches Institut B, RWTH Aachen University and JARA-FIT, Germany — 2Institut für theoretische Physik, Technische Universität Wien, Austria — 3II. Physikalisches Institut, Universität zu Köln, Germany

Epitaxial graphene islands are prepared by ethylene deposition on Ir(111) at room temperature and subsequent annealing to 1050°C. The lateral dimension of the islands varies from 5 nm to 40 nm. Using scanning tunneling spectroscopy we were able to visualize confined states within the islands. The state energies and corresponding local density of states patterns are in good agreement with third nearest neighbor tight-binding calculations for graphene. However, we had to include the potential of the moiré structure as well as a strongly absorbing character of the edge states. The width of the confined state energy peaks has been used to determine the lifetime of the Dirac electrons, which is inversely proportional to energy.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2011 > Dresden