Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 12: Quantum Transport and Quantum Hall Effects (joint session HL/TT)

TT 12.2: Talk

Monday, March 17, 2025, 17:00–17:15, H15

End states in zigzag Haldane model nanoribbons — Simone Traverso, Maura Sassetti, and •Niccolò Traverso Ziani — Physics Department, University of Genova, Italy

As topological materials based on the graphene lattice become experimentally realizable in materials such as germanene, the physics of the bound states that characterize them at step edges and in quasi one-dimensional settings becomes relevant.

In this context, the appearance of topological bound states in zigzag Haldane nanoribbons will be addressed [1]. A reentrant topological phase diagram is found. Together with numerical results, a low energy theory extending the Jackiw-Rebbi paradigm will be presented.

[1] S. Traverso, M.Sassetti, N. Traverso Ziani, NPJ Quantum Materials 9, 9 (2024).

Keywords: Topological insulators; Haldane model; Low energy theory; Tight binding; Downfolding