Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 7: Bosonic Quantum Gases II (joint session Q/A)
A 7.6: Vortrag
Montag, 11. März 2024, 18:15–18:30, Aula
Interplay of topology and disorder in driven honeycomb lattices — •Johannes Arceri1,2,3, Alexander Hesse1,2,3, Christoph Braun1,2,3, Immanuel Bloch1,2,3, and Monika Aidelsburger1,2,3 — 1Fakultät für Physik, Ludwig-Maximilians-Universität München, München — 2Munich Center for Quantum Science and Technology (MCQST), München — 3Max-Planck-Institut für Quantenoptik, Garching
Floquet engineering, i.e., periodic modulation of a system's parameters, has proven as a powerful tool for the realization of quantum systems with exotic properties that have no static analog. In particular, the so-called anomalous Floquet phase displays topological properties even if the Chern number of bulk bands vanishes.
Our experimental platform involves bosonic atoms in a periodically-driven honeycomb lattice. Depending on the driving parameters, several out-of-equilibrium topological phases can be realized, among which an anomalous phase.
Chiral edge modes can be probed by releasing an atomic wavepacket from a tightly focused optical tweezer in proximity of the potential step projected by a digital micromirror device. The additional projection of an optical speckle potential on the honeycomb lattice allows for the realization of disordered systems. We benchmark the robustness of edge modes to disorder across different topological regimes and observe a disorder-driven transition from the Haldane regime to the anomalous regime. Furthermore, we compare edge state dynamics to the expansion of bulk states for increasing disorder strength.
Keywords: topology; Floquet; disorder