SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 36: Topological Insulators

TT 36.9: Vortrag

Mittwoch, 29. März 2023, 17:15–17:30, HSZ 103

Topological phases of one and two Su-Schrieffer-Heeger wires on a semiconducting substrate — •Keshab Sony¹, Anas Abdelwahab², and Eric Jeckelmann³ — ¹Leibniz universität, Hannover, Germany — ²Leibniz universität, Hannover, Germany — ³Leibniz universität, Hannover, Germany

Atomic wires deposited on semiconducting substrates attracted lots of attention in the last two decades as a platform of quasi one-dimension (1D) properties. The Su-Schrieffer-Heeger (SSH) model is one of the simplest models that manifests the typical features of topological phases in quasi 1D characterized by topological invariant (winding number) and corresponding number of zero edge states. In this study, we consider models of one and two SSH wires coupled to semiconducting three-dimensional (3D) substrates and investigate the topological phases of these models with respect to the model parameters, eg. dimerization, wire-wire coupling, wire-substrate hybridization. The phase diagram of single wire coupled to the substrate shows stability of the existing phases without substrate but with changing effectively the wire parameters. We also address the issue of how the presence of the substrate change or preserve the phase diagrams of the two-leg ladders without substrate. We discuss the local density of states for different cases we consider.