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A: Fachverband Atomphysik
A 16: Ultracold Matter IV – Bosons, Rydberg Systems, and Others (joint session Q/A)
A 16.6: Vortrag
Mittwoch, 4. März 2026, 15:45–16:00, P 2
Interplay between topology and disorder in driven honeycomb lattices — •Johannes Arceri1,2, Alexander Hesse1,2, Moritz Hornung1,2, Dizhou Xie1,2, Christoph Braun1,2, and Monika Aidelsburger1,2 — 1Ludwig-Maximilians-Universität, 80799 München, Germany — 2Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
Floquet engineering -periodic modulation of a system's Hamiltonian- has emerged as a powerful tool for the realization of exotic, genuinely out-of-equilibrium quantum systems with no static counterpart. In particular, so-called anomalous Floquet phases display topological edge modes even though bulk bands carry zero Chern number, evading the standard bulk-boundary correspondence.
A defining feature of topological phases of matter is their robustness to spatial disorder. Technique to probe the topological nature of engineered Bloch bands often rely on translational invariance of the underlying lattice, thus failing in the presence of disorder. In the present work, we employ an experimental scheme for real-space detection of edge modes to identify disorder-driven phase transitions between two distinct topological regimes in a periodically driven honeycomb lattice.
Moreover, disordered anomalous Floquet systems are predicted to host a unique topological phase -the anomalous Floquet-Anderson insulator- in which chiral edge modes coexist with Anderson-localized bulk bands. We probe localization in the anomalous Floquet regime by performing quantum walks in modulated lattices, with and without a topological interface.
Keywords: Topology; Floquet-engineering; Disorder