Ruzicka, Brian AndrewWang, ShuaiWerake, Lalani KumariWeintrub, BenLoh, Kian PingZhao, Hui2011-04-062011-04-062010-11B.A. Ruzicka, S. Wang, L.K. Werake, B. Weintrub, K.P. Loh, and Hui Zhao, Hot carrier diffusion in graphene, Physical Review B, 82, 195414 (2010). http://link.aps.org/doi/10.1103/PhysRevB.82.195414https://hdl.handle.net/1808/7360Permissions were not obtained for sharing the full text of this article. Full text is available from the American Physical Society and from arXiv. See links in this record.We report an optical study of charge transport in graphene. Diffusion of hot carriers in epitaxial graphene and reduced graphene oxide samples are studied using an ultrafast pump-probe technique with a high spatial resolution. Spatiotemporal dynamics of hot carriers after a point-like excitation are monitored. Carrier diffusion coefficients of 11,000 and 5,500 squared centimeters per second are measured in epitaxial graphene and reduced graphene oxide samples, respectively, with a carrier temperature on the order of 3,600 K. The demonstrated optical techniques can be used for non-contact and non-invasive in-situ detection of transport properties of graphene.Mesoscale and Nanoscale PhysicsMaterials ScienceOther10.1103/PhysRevB.82.195414openAccess