Thursday, May 16
Graphene Plays Dirty: How Impurities and Imperfections Affect the Physics of Graphene Nanostructures
University of Wisconsin-Madison
Graphene is a monoatomic sheet of graphite with a two-dimensional honeycomb lattice. Today, it is possible to grow and transfer large-area graphene sheets, which can be patterned into devices used for electronic, photonic, and thermoelectric applications. While pristine suspended graphene has remarkably high electronic and lattice conductivities, the influence of substrate impurities and various atomic-sized imperfections drastically affects the transport of charge and heat in realistic graphene nanostructures. However, the physics of "dirty" graphene is rich and exciting in its own right. In this talk, I will present our recent work on detailed microscopic simulation of (1) electronic transport in supported graphene, with emphasis on short-range Coulomb interactions and impurity clustering, and (2) thermal transport in graphene sheets and ribbons, with focus on the diffusive-to-ballistic crossover, the influence of substrate and edge roughness, and grain boundary scattering.
Refreshments at 10:50 AM. Seminar begins at 11:00 AM.
Building 8, Room 241
For further information, please call (909) 869-4014