Low energy theory of graphene
Alexander Altland
Institut fuer Theoretische Physik, Universitaet Koeln, 50937 Koeln, Germany
Last year a team of
British experimentalists suceeded in the preparation of graphene,
a genuinely two dimensional variant of graphite. Closely allied to the
buckminster fullerenes and carbon nanotubes, graphene displays a wealth
of unconventional transport properties, which have triggered an
outburst of recent theoretical activity. Inaccessible to the
conventional tools of many-body physics, many of these phenomena
require the application of state of the art concepts of the theory of
disordered electron systems. In this talk I will give an introduction
to the basic physics of graphene, and introduce a theory describing its
conduction properties at large length scales. Specifically, I will
discuss the intriguing experimental observation of a fully universal
conductance of O(e2/h) in the
system: Is graphene a genuinely metallic system not suffering of Anderson
localization? |