Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 76: Heterostructures
HL 76.6: Vortrag
Donnerstag, 29. März 2012, 10:45–11:00, EW 202
Ab-Initio Investigation of graphene based one-dimensional superlattices — •Lars Matthes1,2, Karsten Hannewald1, and Friedhelm Bechstedt1 — 1Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany — 2Dipartimento di Fisica, Università di Roma "Tor Vergata", via della Ricerca Scientifica 1, 00133 Rome, Italy
Since the two-dimensional material graphene was rediscovered in 2004 by Geim et al. there has been a strong interest in tailoring its properties in order to achieve a broad usability in manifold applications. Furthermore, due to massless electrons appearing in graphene it is also a sandbox for theoretical physicists for testing basic physical theories of high energy physics in a solid state system.
Here we present first-principles studies of electronic and structural properties of various graphene-based one-dimensional superlattice including modifications of pristine graphene by means of hydrogen adsorption, substitution of carbon atoms with boron-nitride as well as a heterostructure including the very recently discovered silicene. [1] We discuss the occurrence of an electronic band gap in these systems, while we focus in particular on the interesting case of graphene-silicene superlattices which provides insights to the physics of heterostructures consisting of materials where both may contain massless Fermions and a vanishing electronic gap around the Fermi-energy. Finally, we also discuss the importance of the 1D interface between those 2D crystalss.
[1] B. Lalmi et al., Applied Physics Letters 97, 223109 (2010)