Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 37: MLT: Poster Session

TT 37.25: Poster

Thursday, March 25, 2010, 14:00–18:00, Poster A

Valley degeneracy of graphene nanoribbons — •Franziska Maier and Guido Burkard — Universität Konstanz, D-78457 Konstanz, Germany

Graphene quantum dots are fabricated by cutting the desired shape out of graphene sheets. Their electronic properties are highly influenced by the shape of lattice termination and effects due to local electric fields and strained bonds.

To allow the design of quantum dots showing specific electronic properties, we investigated the dispersion relation and valley degeneracy of graphene nanoribbons cut in arbitrary directions regarding the lattice. Therefore boundary conditions in form of a local linear restriction on the spinor wave function [1] were used.

[1] A. Akhmerov and C.W.J. Beenakker, Phys. Rev. B 77, 085423 (2008).