Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 62: Invited Talk Rolf Haug
HL 62.1: Hauptvortrag
Donnerstag, 19. März 2015, 09:30–10:00, ER 270
Folded Graphene - Solid State Physics in a Nutshell — •Rolf J. Haug1, Johannes C. Rode1, Hennrik Schmidt1,2, and Dmitri Smirnov1 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, 30167 Hannover, Germany — 2Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore
The folding of a monolayer of graphene results in a stack made up from two single layers of graphene. The atomic lattices are arranged one on top of the other with a certain twist angle between the crystallographic directions of the two layers. Depending on this twist angle the electronic properties of the produced system can be quite different leading to a variety of well known effects of solid state physics. For large twist angles the two layers are actually electronically decoupled [1]. For such twist angles screening effects and variations in Fermi velocities can be observed [2]. For small twist angles much more interesting electronic structures appear. Depending on the twist angle the two atomic lattices give origin to a moiré superstructure resulting in a new electronic band structure of the system [3]. In addition the coupling between the two layers is modulated leading to even more complex electronic effects. In the talk the expected physics of such systems and some recent experimental results will be reviewed. [1] H. Schmidt et al., Appl. Phys. Lett. 93, 172108 (2008) [2] H. Schmidt, T. Lüdtke, P. Barthold, R.J. Haug, Phys. Rev. B 81 121403 (2010) [3] H. Schmidt, J. C. Rode, D. Smirnov, R.J. Haug, Nature Comm. 5, 5742 (2014)