SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Quantum Transport and Quantum Hall Effects I (joint session HL/TT)

TT 15.6: Vortrag

Montag, 27. März 2023, 16:45–17:00, JAN 0027

Structure-imposed electronic topology in graphene nanoribbons — •Florian Arnold¹, Tsai-Jung Liu¹, Agnieszka Kuc², and Thomas Heine^1,2,3 — ¹Technische Universität Dresden, Dresden, Germany — ²HZDR, Leipzig, Germany — ³Yonsei University, Seoul, Republic of Korea

Zigzag graphene nanoribbons (ZGNR) can be transformed into new structure types by removing terminal carbon atoms in a regular pattern. When a single atom is removed on each zigzag edge so-called cove-edged ZGNR (ZGNR-C) are created, while removing multiple atoms results in gulf-edged ZGNR (ZGNR-G). In our seminal work, we demonstrated the direct structure-electronic structure relation based on the structural parameters that unambiguously characterize ZGNR-C. This allowed to create a scheme that classifies their electronic state, i.e., if they are metallic, topological insulators or trivial semiconductors, and to find an empirical formula for the band gap of the semiconducting ribbons. Since then, we were able to expand this description to ZGNR-G systems where the chemical space of possible structures increases further due to the variable size of the gulf edges. With this, we give guidance to realize new graphene nanoribbon heterojunctions hosting topological states and investigate the transport properties of exemplary systems.