Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 73: Topology: Other Topics

TT 73.1: Vortrag

Freitag, 20. März 2020, 11:00–11:15, HSZ 103

Electronic transport in one-dimensional Floquet topological insulators via topological-and non-topological edge states — •Niclas Müller1, Dante M. Kennes1, Jelena Klinovaja2, Daniel Loss2, and Herbert Schoeller11Institut für Theorie der Statistischen Physik, RWTH Aachen, 52074 Aachen,Germany — 2Department of Physics, University of Basel, Klingelbergstr. 82, CH-4056 Basel, Switzerland

Based on probing electronic transport properties, we study the recently discovered phase diagram of 1D Floquet topological insulators [Kennes et al., Phys. Rev. B 100, 041103(R) (2019)]. Using Keldysh formalism, we compute transport properties of this model, where we consider a setup in which states with a large relative edge-weight primarily contribute to the transport, which grants experimental access to the topological phase diagram. Surprisingly, we find conductance values similar in magnitude to those corresponding to topological edge states, when tuning the lead Fermi energy to special values in the bulk, which coincide with bifurcation points of the dispersion relation in quasimomentum space. These peaks reveal the presence of bands of states whose wave functions are linear combinations of delocalized bulk states and exponentially localized edge states, where the amplitude of the edge-state component is sharply peaked at the bifurcation point, resulting in an unusually large relative edge-weight. We discuss the emergence of these states in terms of an intuitive yet quantitative physical picture, which is not specific to the model, suggesting that they may be present in a wide class of systems.

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