Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Topological Insulators

TT 18.7: Vortrag

Mittwoch, 7. September 2022, 11:00–11:15, H23

Quantum phase transitions and a disorder-based filter in a Floquet system — •Bhargava Balaganchi Anantha Ramu, Sanjib Kumar Das, and Ion Cosma Fulga — IFW Dresden and Wurzburg-Dresden Cluster of Excellence ct.qmat, Helmholtzstrasse 20, 01069 Dresden, Germany

Two-dimensional periodically-driven topological insulators have been shown to exhibit numerous topological phases, including ones which have no static analog, such as anomalous Floquet topological phases. We study a two dimensional model of spinless fermions on a honeycomb lattice with periodic driving. We show that this model exhibits a rich mixture of weak and strong topological phases, which we identify by computing their scattering matrix invariants. Further, we do an in-depth analysis of these topological phases in the presence of spatial disorder and show the relative robustness of these phases against imperfections. Making use of this robustness against spatial dis-order, we propose a filter which allows the passage of only edge states, and which can be realized using existing experimental techniques.