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Q: Fachverband Quantenoptik und Photonik
Q 54: Posters: Quantum Optics and Photonics IV
Q 54.41: Poster
Donnerstag, 12. März 2020, 16:30–18:30, Empore Lichthof
Floquet-phases in Optical Kagome Lattices — •Marcel Kosch1, Luca Asteria1, Henrik Zahn1, Bojan Hansen1, Klaus Sengstock1,2,3, and Christof Weitenberg1,2 — 1Institut für Laserphysik, Universität Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany — 3Zentrum für Optische Quantentechnologien, Universität Hamburg, Germany
The Kagome lattice is a hexagonal lattice with a three-atomic basis and has received considerable interest due to its flat band, which should give rise to spin liquid phases. While naturally the uppermost of the three bands is flat, this structure can be inverted by applying Floquet shaking.
Already at smaller shaking amplitudes, a circular shaking induces topological bands analogous to the Haldane model in the driven honeycomb lattice, however, with a more favorable flatness ratio between the band width and band gap. It is therefore a promising starting point for the study of interacting topological phases.
In this poster, we present a numerical study of the topological phase diagram of the driven optical Kagome lattice. We also recall how it can be realized as a hexagonal superlattice from two commensurate wavelengths and describe how it will be realized in our setup of ultracold fermionic and bosonic quantum gases.