Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 43: Graphene: Electronic Properties, Structure and Substrate Interaction II (joint session O/TT)
TT 43.7: Vortrag
Dienstag, 13. März 2018, 12:15–12:30, MA 043
Landau-level spectroscopy of twisted epitaxial graphene multilayers on a metal substrate — •Sabina Simon1, Elena Voloshina2, Julia Tesch1, Felix Förschner1, Vivien Enenkel1, Charlotte Herbig3, Timo Knispel3, Alexander Tries4, Jörg Kröger4, Yuriy Dedkov1,2, and Mikhail Fonin1 — 1Department of Physics, University of Konstanz, 78457 Konstanz, Germany — 2Physics Department, Shanghai University, Shanghai 200444, China — 3Institute of Physics II, University of Köln, 50937 Cologne, Germany — 4Institut für Physik, Technische Universität Ilmenau, 98693 Ilmenau, Germany
Due to its potential in the development of new generation technologies, graphene remains the focus of many theoretical and experimental studies, principally when considering high-quality, large-scale epitaxial growth. In this work we investigate multilayered graphene systems epitaxially grown on Ir(111). Large patches of graphene twisted layers of high quality are fabricated upon atomic carbon intercalation underneath a continuous graphene sheet. By means of scanning tunneling spectroscopy in magnetic filed we study the evolution of the Landau-level spectra reflecting the variation of local electronic properties of the top graphene layer. We show that bilayers with large twist angles as well as twisted trilayers exhibit the electronic properties characteristic for a pristine graphene monolayer, pointing towards an effective decoupling of the top layer from the metal substrate. Complementary, we investigate changes in electronic properties of twisted graphene induced by subsequent alkali metal intercalation.