Physics (Internal)

Local electronic properties of graphene

This event is part of the Biophysics/Condensed Matter Seminar Series.

Abstract: Combining scanning probe microscopy with electrical transport measurements is a powerful approach to probe low-dimensional systems. The local information provided by scanning probe microscopy is invaluable for studying effects such as electron-electron interactions and scattering. Using scanning tunneling microscopy, we have probed the local electronic properties of graphene with atomic resolution. We studied the effect of ripples, charged impurities and defects on the local density of states. We find that long-range scattering from ripples and impurities shifts the Dirac point leading to the formation of electron and hole puddles. Short-range scattering from lattice defects is peaked near the Fermi energy and mixes the two sublattices of graphene.