Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Topological Insulators

TT 18.8: Vortrag

Mittwoch, 7. September 2022, 11:15–11:30, H23

Topological phases of Su-Schrieffer-Heeger alternating ladders — •Anas Abdelwahab — Leibniz Universität Hannover, Hannover, Germany

Alternating ladders are constructed from unit cells consisting of rungs with odd number of sites connected with rungs with even number of sites [1]. These systems can be constructed using several options of equivalent unit cells. Two one-site rungs connected with two two-site rungs as well as two three-site rungs connected with two two-site rungs are investigated. Rich phase diagrams of topological insulating phases separated by critical lines are identified using the Su-Schrieffer-Heeger (SSH) model that describe such ladder systems. The phase diagrams depend on the choices between the equivalent unit cells. One could identify cases with flat bands close to the Fermi level. In principle, these simple models can be realized in designer quantum materials such as artificial lattices constructed by manipulation of atoms using a tip of scanning tunnelling microscope (STM) [2,3].

[1] K. Essalah, A. Benali, A. Abdelwahab, E. Jeckelmann, and R. T. Scalettar, Phys. Rev. B 103, 165127 (2021)
[2] R. Drost, T. Ojanen, A. Harju and P. Liljeroth, Nat. Phys. 13, 668 (2017)
[3] M. N. Huda, S. Kezilebieke, T. Ojanen, R. Drost and P. Liljeroth, npj Quantum Materials 5, 17 (2020)