Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 14: 2D Materials: Session II (joint session DS/CPP/HL)
HL 14.4: Vortrag
Dienstag, 13. März 2018, 10:15–10:30, H 2032
Transition between rhombohedral and Bernal stacking in multilayer graphene flakes — •Fabian Rudolf Geisenhof1, Felix Winterer1, and Ralf Thomas Weitz1,2 — 1Physics of Nanosystems, Physics Department, Ludwig Maximilians Universität München — 2NanoSystems Initiative Munich (NIM) and Center for NanoScience (CeNS)
Quantum transport in multilayer graphene is interesting in many aspects. For example, it was shown that in ultraclean samples of graphene bilayers [1] and recently also multilayers [2], the exchange interaction leads to a novel phase, who's nature is currently still under debate. At the heart of answering this question is knowledge of the local stacking order during charge transport experiments. Here, we show that the fabrication process has an impact on the structural properties of the flakes. It can lead to the formation of ripples and even to a non-local transition from ABC to ABA stacking. This transformation has been identified by spatially resolved Raman and scattering SNOM measurements, and we discuss possible reasons.
[1] R.T. Weitz, M.T. Allen, B.E. Feldman, J. Martin, and A. Yacoby, "Broken-symmetry states in doubly gated suspended bilayer graphene", Science 330, 812 (2010)
[2] Y. Nam, D.-K. Ki, M. Koshino, E. McCann and A.F Morpurgo, "Interaction-induced insulating state in thick multilayer graphene", 2D Mater. 3 045014 (2016)