Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 66: Graphene: Electronic Properties, Structure and Substrate Interaction I (joint session DY, DS, HL, MA, O, TT, organized by O)

TT 66.5: Vortrag

Donnerstag, 23. März 2017, 11:30–11:45, WIL A317

Landau Level Spectroscopy of Twisted Graphene Layers on Ir(111) — •Sabina Simon¹, Felix Förschner¹, Vivien Enenkel¹, Fabian Geml¹, Yuriy Dedkov¹, Timo Knispel², Charlotte Herbig², Thomas Michely², and Mikhail Fonin¹ — ¹Department of Physics, University of Konstanz, 78457 Konstanz, Germany — ²Institute of Physics II, University of Köln, 50937 Köln, Germany

Epitaxial growth on metal substrates is known to be one of the most powerful approaches in producing large-scale, high-quality, monolayer graphene. Yet it remains a major challenge to realize the growth of multilayers.

This work is devoted to the investigation of multilayered graphene systems epitaxially grown on a transition metal, namely Ir(111). We address the growth and the structure of large scale twisted graphene bilayers by intercalation of atomic carbon under graphene on Ir(111). We show that the intercalated graphene buffer layer provides sufficient decoupling from the metal substrate, giving a possibility to access the local electronic properties of graphene by means of Landau level spectroscopy. We further discuss the influence of the twist angle on the local electronic properties of the top graphene layer, upon the analysis of the doping level, Fermi velocity of charge carriers, and quasiparticle lifetimes.