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Q: Fachverband Quantenoptik und Photonik

Q 25: Poster: Quantum Optics and Photonics I

Q 25.15: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Atrium Informatik

Bose-Einstein condensation in higher Bloch bands of a honeycomb optical lattice — •Tobias Klafka, Alexander Ilin, Julius Seeger, Mario Neundorf, Klaus Sengstock, and Juliette Simonet — Institut für Laserphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg

Bose-Einstein condensates in higher Bloch bands of optical lattices immensely extend the possibilities for quantum simulation of solid-state models by providing new orbital degrees of freedom. In combination with appropriate lattice symmetries these orbital optical lattices give rise to unconventional superfluids with exotic properties. Here, we report on Bose-Einstein condensation in the second Bloch band of a honeycomb optical lattice realized by dynamically tuning the energy offset between the two sublattices. We have investigated the process of recondensation and optimal transfer tracing the dynamics in the Brillouin zones after the initial excitation. In addition, our preparation technique allows us to efficiently transfer superfluids into even higher Bloch bands where unexplored topological quantum phases shall emerge.