Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: (Quantum) Transport Properties

HL 7.6: Talk

Monday, September 5, 2022, 16:45–17:00, H31

Structure-imposed electronic topology in cove-edged 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

Cove-edged zigzag graphene nanoribbons (ZGNR-C) take their name from a regular pattern of coves which is formed by removing one terminal CH group per length unit on each zigzag edge. Based on three structural parameters that unambiguously characterize the atomistic structure of ZGNR-C, we present a scheme that classifies their electronic state, i.e., if they are metallic, topological insulators or trivial semiconductors, for all possible widths N, unit lengths a and cove position offsets at both edges b, thus showing the direct structure-electronic structure relation. We further present an empirical formula to estimate the band gap of the semiconducting ribbons from N, a, and b. Finally, we show possible ribbon terminations, which should give guidance for future synthetic efforts to realize new topological ZGNR-C with large band gap and to realize topologically protected edge states in these systems.