Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Poster Session: Topological Topics (joint session TT/MA)

TT 18.11: Poster

Montag, 1. April 2019, 15:00–18:30, Poster D

Effects of topological line defects on two-dimensional electronic transport — •Nico Baßler and Kai Schmidt — Institut für Theoretische Physik I, Universität Erlangen-Nürnberg, Staudtstraße 7, 91058 Erlangen, Germany

We investigate the effect of topological line defects on the transport properties of two-dimensional electronic systems. Experimentally, this is mostly motivated by bilayer graphene which is known to host a superstructure of line defects separating AB- and BA-stacking domains. More concretely, we study microscopically specific arrangements of such line defects by calculating the conductance, local densities, and topological invariants using an effective one-particle description for bilayer graphene in a magnetic field. In addition, we compare our findings to the well-known Haldane model on the honeycomb lattice, which is exactly solvable in the absence of line defects and displays a topologically non-trivial band structure.