Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 26: Transport: Graphene and Carbon Nanotubes

TT 26.15: Vortrag

Mittwoch, 25. März 2009, 18:15–18:30, HSZ 03

Ballistic electrons in graphene antidot lattices - a numerical study — •Jan Bundesmann, Jürgen Wurm, Michael Wimmer, Inanc Adagideli, and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany

Motivated by recent experiments at the University of Regensburg we study quantum transport properties of charged carriers in graphene antidot lattices. To this end we perform numerical quantum transport simulations on a tight-binding honeycomb lattice with antidots cut out of the lattice using recursive Greens function methods.

Our main focus lies on magnetoconductance and weak localization due to scattering from antidots. We find that the magnetic field profile of the weak localization curve is similar to results from semiclassics and random matrix theory of chaotic cavities.

We further discuss the relevance of intervalley scattering on the magnitude of the weak localization peak.