Dresden 2011 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 44: Poster Session I
HL 44.12: Poster
Tuesday, March 15, 2011, 18:00–21:00, P3
Micromechanical sensor for magnetization studies on few layer graphene — •Amadeus K. Mlynarski1, Paul Berberich1, Matthias Brasse1, Karthik Sridhara1, Benedikt Rupprecht1, Stefanie Heydrich2, Marc A. Wilde1, and Dirk Grundler1 — 1Lehrstuhl für Physik funktionaler Schichtsysteme, Technische Universität München, Physik Department, James-Franck-Str. 1, D-85747 Garching b. München, Germany — 2Institut für Experimentelle und Angewandte Physik, Universität Regensburg, D-93040 Regensburg
Graphene is a strictly two-dimensional material exhibiting novel electronic properties due to its peculiar band structure. For graphene, magnetic edge states, a diverging magnetic susceptibility around the charge neutrality point and an unconventional de Haas - van Alphen effect have been predicted. Measuring the magnetization M=−∂ U/∂ B for a temperature T→0 yields direct access to the ground state energy U of the charge carriers in graphene. Thermodynamic energy gaps in the density of states between neighboring Landau levels can be measured directly.
We intend to measure M of chemical-vapor-deposited few layer graphene (FLG) down to 300 mK and high magnetic fields up to 16 T. The FLG is characterized using magnetotransport measurements prior to the magnetization experiments. A specially designed micromechanical sensor is fabricated to allow for high sensitive magnetization measurements.
We thank the DFG for financial support in the SPP1459 grant no. WI3320/1-1.