Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 74: Topological Insulators
TT 74.11: Talk
Thursday, March 21, 2024, 17:45–18:00, H 3005
Transport channels in the two-dimensional, Floquet-driven Qi-Wu-Zhang model — •Aya Abouelela1, Haixin Qiu2, and Johann Kroha1,3 — 1Universität Bonn, Germany — 2Georg August Universität Göttingen, Germany — 3University of St. Andrews, U.K
This presentation explores the realm of topological phases, with a specific focus on topological insulators and their edge states. Over the past decade, the field has witnessed rapid developments in the external drive of these systems, with periodically driven or Floquet systems standing out for their ability to induce diverse topological phases through a seemingly simple dynamical control. Our talk centers on anomalous Floquet topological phases within a hopping-driven Qi-Wu-Zhang model. We showcase the impact of drive parameters such as amplitude, frequency, and on-site potential on band Chern numbers, unveiling the emergence of anomalous edge states. Utilizing Chern number phase diagrams, we present edge states with vanishing dynamical winding numbers or Chern numbers. Additionally, we propose experimentally realizable slab geometry of our model with finite bias voltage and predict dI/dV spectroscopy exhibiting quantized transport carried by the zero and anomalous modes. Finally, we map out the spatial structure of the transport channels and highlight the transmission along the system's physical edge. Notably, the slab geometry exhibits corner sites with a high density of states, which may originate from higher order corner states.
Keywords: Topological insulators; Periodic drive; Floquet systems; Quantized transport; Transmission channels