Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 71: Poster Session: Graphene / Topological Insulators / Interfaces and Surfaces

HL 71.2: Poster

Mittwoch, 28. März 2012, 16:00–19:00, Poster D

Magnetism of Dirac Fermions — •Stephan Albert, Stefanos Chalkidis, Amadeus Mlynarski, Marc Wilde, and Dirk Grundler — James-Franck-Straße 1, 85747 Garching, Deutschland

The two-dimensional electron system of graphene exhibits a quasirelativistic dispersion relation with high mobility. Torsional cantilever magnetometry might be powerful to investigate the intriguing electronic properties via the magnetization. The ground state density of states can be mapped out which allows insight into electron-electron interaction, energy gaps and the predicted divergence of the magnetic susceptibility for vanishing magnetic field at the neutrality point. We introduce our measurement technique, and our experimental setup adapted for graphene. We report on the development of tailor-made microcantilevers by etching of SOI wafers and on sample preparation as well as the electronic characterization of exfoliated graphene prior to the magnetization measurements. Financial support by the DFG via project no. WI3320/1-1 in the priority programme "Graphene" as well as experimental support by the Nanosystems Initiative Munich is gratefully acknowledged.