Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.75: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Dynamical Mean-Field Theory of Rydberg-dressed quantum gases in optical lattices — •Andreas Geißler, Ivana Vidanovic, and Walter Hofstetter — Goethe Universität, Frankfurt, Hessen

As recent experiments have shown, it is now possible to investigate Rydberg-dressed quantum systems in optical lattices with a large number of Rydberg excitations. Here we investigate these strongly correlated systems for the bosonic case, by applying the real-space extension of bosonic dynamical mean-field theory (R-BDMFT) to the two-species lattice Hamiltonian in two and three dimensions. We find new exotic quantum phases of lattice commensurate order, giving rise to a devil's staircase in the filling as a function of the chemical potential. For increased hopping, a nonzero condensate fraction starts to emerge, which can coexist with the spatial density order, and thereby lead to a supersolid phase. A rich phase diagram is obtained in our simulations for experimentally realistic parameters.