Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 74: Nanostructured Surfaces and Thin Films I: Synthesis and Properties (joint session O/CPP)
O 74.3: Talk
Wednesday, March 18, 2020, 15:30–15:45, WIL B321
Interaction of topological boundary states in graphene nanoribbon heterojunctions — •Qiang Sun1, Oliver Gröning1, Xuelin Yao2, Akimitsu Narita2, Klaus Müllen2, Pascal Ruffieux1, and Roman Fasel1 — 1Empa, Swiss Federal Laboratories for Materials Science and Technology, nanotech@surfaces Labora-tory, 8600 Dübendorf, Switzerland — 2Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
Graphene nanoribbons (GNRs), narrow stripes of graphene, are promising candidates for future elec-tronic applications due to their widely adjustable electronic properties. The precise control of their atomic structure, including their termini, edges and width, allow for the realization of specific electronic quantum phases. For example, GNRs with chiral edges or cove edges have been predicted to host spin-polarized edge states. And recently, topological electronic quantum phases have been predicted and realized in the junctions between GNR segments belonging to different topological classes. Here, I will show the synthesis and characterization of width-modulated GNRs that host topological junction states. By investigating such GNRs as a function of the number of periodically aligned junction states along the GNR axis, we follow the evolution of the new electronic bands formed by the finite overlap between the junction states. Furthermore, we investigate the interaction between boundary states in topological heterojunctions, revealing an interaction-induced energy splitting that decays exponentially with their relative separation.