Regensburg 2016 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 86: Graphene: Electronic Properties and Structure
(Joint session of DS, DY, HL, MA, O and TT organized by O)

TT 86.5: Talk

Friday, March 11, 2016, 11:30–11:45, S051

How partial dislocations may make bilayer graphene both an insulator and a conductor — Heiko Weber¹ and •Sam Shallcross² — ¹Lehrstuhl für Angewandte Physik, Universität Erlangen-Nürnberg, Staudtstr. 7 A3, 91058 Erlangen, Germany — ²Lehrstuhl für theoretische Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7 B2, 91058 Erlangen, Germany

Recently imaged partial dislocations in bilayer graphene [1] have been shown to have a profound impact on transport properties for the case of bilayer graphene on SiC [2]. We demonstrate that the presence of only a few partial dislocations in high quality suspended bilayer graphene can both destroy the intrinsic minimal conductivity of the structurally perfect bilayer, or even enhance it, depending only on the configuration of the partials. The provides a natural explanation for the peculiar behaviour of suspended bilayer graphene, in which seemingly very similar samples are found to be either insulating or conducting in nature.

[1] B. Butz, C. Dolle, F. Niekiel, K. Weber, D. Waldmann, H. B. Weber, B. Meyer, E. Spiecker, Nature 505, 533 (2014). [2] F. Kisslinger, C. Ott, C. Heide, E. Kampert, B. Butz, E. Spiecker, S. Shallcross, H. B. Weber, Nature Physics 11, 650 (2015).