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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.26: Poster

Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B

Non-equilibrium states in graphene rings driven by ultrashort light pulses — •Andrey Moskalenko and Jamal Berakdar — Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Germany

Graphene became a hot topic since the demonstration of its fabrication because of the quasi-relativistic properties of its band structure. Mesoscopic effects are of a particular interest as they exhibit features unusual for metallic or semiconductor mesoscopic structures. Recently, mesoscopic graphene rings were fabricated. The properties of the Aharonov-Bohm effect were investigated theoretically and experimentally. We investigate non-equilibrium mesoscopic effects in graphene rings excited by picosecond asymmetric electromagnetic pulses. Ultrafast generation of charge-polarized and current-carrying states is demonstrated and illustrated for the experimentally relevant parameters of the graphene ring.