Karsten Horn

Title

Graphene - Electronic Structure of an Intriguing Material

Abstract

Graphene, the single sheet of carbon atoms which is the building block of graphite and carbon nanotubes, has recently attracted a great deal of attention because of its unusual transport properties. These can only be understood on the basis of "massless Dirac Fermion" charge carriers, arising from its unusual band structure. Owing to this, a "relativistic" condensed-matter physics has emerged, where quantum relativistic phenomena can now be tested in table-top experiments. In the talk I will deal with the electronic structure of graphene which is at the core of its properties, as determined through valence level photoelectron spectroscopy. The band structure in the monolayer, and the transition from true 2D character towards the bulk-like multilayer regime will be analysed. The specific properties of the bilayer, and the influence of many-body excitations on the spectral function of graphene will also be covered.