Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Transport: Poster Session

TT 58.45: Poster

Mittwoch, 9. März 2016, 15:00–18:30, Poster D

Magnetotransport in Graphene on the Nano Scale — Philip Willke, •Thomas Kotzott, and Martin Wenderoth — IV. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

Magnetotransport in graphene gives rise to a variety of fascinating phenomena like the quantum Hall effect and weak and/or strong localization. Often the origin of these phenomena lies on the atomic scale governed by the crystal structure as well as the scattering mechanisms involved. While macroscopic transport measurements only give an average over all scattering contributions, we combine magnetotransport experiments with atomic scale resolution. We introduce a new magnetic field scanning tunneling potentiometry setup to investigate the local voltage drop in epitaxial graphene below the quantum limit. While monolayer and bilayer graphene sheets show a locally varying quadratic magnetoresistance larger than the macroscopic average, scattering processes at localized defects are almost independent of magnetic field.