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Q: Fachverband Quantenoptik und Photonik
Q 52: Floquet Engineering and Topology
Q 52.7: Talk
Thursday, March 9, 2023, 16:15–16:30, E001
Observation of edge states in topological Floquet systems — •Alexander Hesse1, 2, Christoph Braun1, 2, 3, Raphaël Saint-Jalm1, 2, Johannes Arceri1, 2, Immanuel Bloch1, 2, 3, and Monika Aidelsburger1, 2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität München, München, Germany — 2Munich Center for Quantum Science and Technology (MCQST), München, Germany — 3Max-Planck-Institut für Quantenoptik, Garching, Germany
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 the bulk band vanishes. [1]
Our experimental system consists of bosonic atoms in a periodically driven honeycomb lattice. Depending on the driving parameters, several out-of-equilibrium topological phases can be realized, including an anomalous phase. [2]
As the bulk-boundary correspondence relates the properties of the bulk bands to the number of topologically protected edge modes, special interest lies in studying the behavior of them. We are investigating the real-space evolution of a wavepacket close to the edge after the release from a tightly-focused optical tweezer. This way, we observe the chiral nature of the edge state, even in the anomalous Floquet phase, thereby directly revealing the topological nature of this phase.
[1] Rudner et al., Phys. Rev. X 3, 031005 (2013)
[2] Wintersperger et al., Nat. Phys. 16, 1058-1063 (2020)