Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: Poster Session Transport

TT 38.36: Poster

Mittwoch, 16. März 2011, 14:00–18:00, P3

Superlattice Effects on Graphene Nanoribbons — •Fedor Tkatschenko, Jan Bundesmann, and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany

We study how an additional, spatially modulated electric field affects the electronic properties of graphene nanoribbons. Previous efforts [1, 2] investigated peculiar effects on the electronic structure of bulk graphene such as the emergence of new Dirac points in the energy spectrum and an anisotropic velocity renormalization. These new characteristics are also reflected in the density of states and the conductivity. Insted of the bulk we will here consider the influence of a periodic modulation, oriented along the direction of a graphene nanoribbon, on its bandstructure and transport properties. To this end we employ a numerical Green function method based on the tight binding graphene Hamiltonian.
M. Barbier, P. Vasilopoulos, and F. M. Peeters, Phys. Rev. B 79 115427 (2010)
Li-Gang Wang, and Shi-Yao Zhu, Phys. Rev. B 81 205444 (2010)