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TT: Fachverband Tiefe Temperaturen

TT 27: Symposium “Graphene”

TT 27.1: Hauptvortrag

Donnerstag, 29. März 2007, 14:00–14:30, H20

Graphene: New bridge between condensed matter physics and QED — •Mikhail Katsnelson — Radboud Universiteit Nijmegen, Toernooiveld 1, Nijmegen, 6525 ED, THe Netherlands

Graphene, which is the first example of truly two-dimensional crystals (it's just one layer of carbon atoms) turns out to be gapless semiconductor with unique electronic properties resulting from the fact that charge carriers in graphene demonstrate charge-conjugation symmetry between electrons and holes and possess an internal degree of freedom similar to chirality of ultrarelativistic elementary particles. It provides unexpected bridge between condensed matter physics and quantum electrodynamics. In particular, the Klein paradox of relativistic quantum mechanics is of crucial importance for design of carbon-based transistors; vacuum polarization around charge impurities is essential to understand electron mobility; *index theorem* explains anomalous quantum Hall effect in graphene.