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TT: Fachverband Tiefe Temperaturen
TT 72: Graphene II: Adsorption, Intercalation and Doping (joint session O/TT)
TT 72.6: Vortrag
Freitag, 20. März 2020, 11:45–12:00, GER 37
Epitaxial growth of high-quality armchair graphene nanoribbons — •H. Karakachian1, J. Aprojanz2, T. T. N. Nguyen2, A. A. Zakharov3, R. Yakimova4, P. Rosenzweig1, C. M. Polley3, T. Balasubramanian3, C. Tegenkamp2, and U. Starke1 — 1Max-Planck-Institut für Festkörperforschung, Stuttgart — 2Institut für Physik, Technische Universität Chemnitz — 3MAX IV laboratory, Lund — 4IFM, Linköping University
Graphene nanoribbons (GNRs) are considered to be the fundamental building blocks for future carbon-based nanoelectronics. The functionality of GNRs is governed by the detailed atomic structure of their edges. Namely, a GNR terminated by armchair edges develops a bandgap in its electronic structure driven by quantum confinement effects, where the size of the bandgap scales with the width of the ribbon itself. Thus, the controlled growth of armchair GNRs (AC-GNRs) may solve the long-lasting problem of graphene, which is its inability to be embedded in modern quantum integrated circuitry. Here, we grow high-quality AC-GNRs on the sidewalls of 6H-SiC mesa structures. Using angle-resolved photoelectron spectroscopy we study the electronic structure of the one-dimensionally (1D) confined AC-GNRs which truly reveals a width-dependent bandgap formation. We observe a set of well-resolved sub-bands and a Fermi surface that consists strictly of a straight line which are characteristic features of 1D confined systems. Our findings provide a solid ground for further theoretical assessment and a deeper understanding of quantum confinement phenomena.