Regensburg 2010 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 6: Poster Session I
DY 6.38: Poster
Montag, 22. März 2010, 16:00–18:00, Poster B2
Microwave measurements on graphene-like structures — •Sonja Barkhofen1, Ulrich Kuhl1, Hans–Jürgen Stöckmann1, and Fabrice Mortessagne2 — 1Fachbereich Physik, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany — 2Laboratoire de Physique de la matière condensée, CNRS UMR 662, Université de Nice -Sophia Antipolis- 06108 Nice cedex 2, France
Electrons in graphene lattices close to the K point can be described by the Dirac equation because of their linear dispersion with k, thus allowing to study quantum electrodynamic phenomena in the solids [1]. We rebuilt graphene’s hexagonal structure with high permittivity index discs in a microwave set-up. A tight binding regime for the coupling was found by varying the distance of two or three coupled scatterers. At the Dirac point a vanishing triangular density of states is found via reflection measurements, whereas measurements at corners showed edge states at the Dirac point.
[1] G.W. Semenoff, Phys. Rev. Lett. 51 (1984) 2449