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Q: Fachverband Quantenoptik und Photonik
Q 54: Posters: Quantum Optics and Photonics IV
Q 54.40: Poster
Donnerstag, 12. März 2020, 16:30–18:30, Empore Lichthof
Topological effects in Floquet-engineered ultracold matter — Luca Asteria1, •Henrik Zahn1, Marcel Kosch1, Bojan Hansen1, Klaus Sengstock1,2,3, and Christof Weitenberg1,2 — 1Institut für Laserphysik, Universität Hamburg, Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany — 3Zentrum für Optische Quantentechnologien, Universität Hamburg, Hamburg, Germany
Ultracold atoms in optical lattices constitute a versatile platform to study the fascinating phenomena of gauge fields and topological matter. Periodic driving can induce effective Floquet Hamiltonians with non-trivial Chern number and thus paradigmatic models, such as the Haldane model on the honeycomb lattice, can be directly engineered. Here we present our recent experiments, in which we realized new approaches for measuring the Chern number in this system and map out the Haldane phase diagram. This includes quantized circular dichroism as a dissipative analog of the quantized Hall conductance as well as time-resolved Bloch-state tomography allowing for the observation of a dynamical linking number. These experiments define an excellent starting point for the exploration of interacting topological phases with ultracold atoms.