Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 17: Poster I

HL 17.9: Poster

Montag, 25. Februar 2008, 16:30–19:00, Poster D

Transport in antidot lattices in graphene layers — •Jonathan Eroms, Ulrich Stöberl, and Dieter Weiss — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040 Regensburg

We prepared antidot lattices in single and bilayer graphene sheets using electron beam lithography and reactive ion etching. The lattice period a was ranging between 140 nm and 200 nm. In single layer samples with a lattice period of 200 nm we find quantum Hall plateaus and Shubnikov-de Haas oscillations with the half-integer quantization that is commonly observed in single layer samples. We also find a pronounced weak localization peak in the longitudinal resistance. The mobility of the graphene flake was not sufficient to observe commensurability peaks of the antidot lattice. In samples with very narrow constrictions between the antidots, we observe a suppression of the conductance in a finite range of back gate voltage, i.e., a gap develops.