Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 9: Poster 1

HL 9.79: Poster

Montag, 23. März 2009, 14:30–17:00, P2

Magnetotransport on evenly curved graphene and thin graphite — •Karen Peters, Ursula Wurstbauer, Stefan Mendach, and Wolfgang Hansen — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg

We study evenly curved conventional and massless dirac fermions in graphite and graphene with transport measurements. To experimentally realise evenly curved graphene and thin graphite sheets with metal contacts for transport experiments we use semiconductor-graphene metal hybrid microscrolls with rolled-in sheets of thin graphite. The specific semiconductor substrates are grown on semi-insulating (001) GaAs by means of molecular beam epitaxy and include a degenerate doped back-electrode to tune the position of the Fermi energy via field effect. Further the established method of preparation, electrical and morphological characterisation of graphene layers on SiO2 is transferred to graphite deposited on GaAs substrates. Graphene on GaAs is characterized by scanning electron microscopy (SEM) and patterned with optical as well as electron beam lithography or by local oxidation with an AFM tip. Transport will be studied as function of the carrier type and density adjusted by the gate electrode and of a magnetic field which perpendicular component is sinusoidally modulated along the perimeter of the microscroll. In first experiments we use thin graphite in two-terminal geometry for optimisation of the fabrication process.