title: Carrier drift velocity and edge magnetoplasmons in graphene.
abstract: We investigate electron dynamics at the graphene edge by studying the propagation of collective edge magnetoplasmon excitations. By timing the travel of narrow wave packets on picosecond time scales around exfoliated samples, we find chiral propagation with low attenuation at a velocity that is quantized on Hall plateaus. We extract the carrier drift contribution from the edge magnetoplasmon propagation and find it to be slightly less than the Fermi velocity, as expected for an abrupt edge. We also extract the characteristic length for Coulomb interaction at the edge and find it to be smaller than that for soft depletion-edge systems.
authors: Service de Physique de l'État Condensé, Commissariat à l'Énergie Atomique, 91191 Gif-sur-Yvette, France. ivana.petkovic@yale.edu
authors: I
authors: I
authors: Petković
authors: F I B
authors: FI
authors: Williams
authors: K
authors: K
authors: Bennaceur
authors: F
authors: F
authors: Portier
authors: P
authors: P
authors: Roche
authors: D C
authors: DC
authors: Glattli