Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics III
Q 62.6: Poster
Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer
Dynamical Mean-Field Theory of Rydberg-dressed quantum gases in optical lattices — •Andreas Geißler1, Mathieu Barbier1, Ivana Vasic2, and Walter Hofstetter1 — 1Goethe Universität, Frankfurt a. M., Germany — 2University of Belgrade, Belgrade, Serbia
Recent experiments have shown that Rydberg-dressed quantum many body systems with large numbers of Rydberg excitations in an optical lattice are within reach. We have studied these strongly correlated systems for the bosonic case both within the Gutzwiller approximation (GA) and in a real-space bosonic extension of Dynamical Mean-Field Theory (RB-DMFT) for a two-species lattice Hamiltonian. While RB-DMFT becomes computationally demanding for high lattice fillings, the GA still allows for a thorough investigation of the phase space. 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, long-range interaction and Rabi laser detuning. With increasing hopping, a nonzero condensate fraction starts to emerge, which can coexist with the spatial density-wave order, giving rise to a series of supersolid phases. Spontaneously broken lattice symmetries imply an anisotropic superfluid fraction. We obtain a rich phase diagram in our simulations for the chosen range of experimentally relevant parameters.