Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 40: Poster: Quantum Optics and Photonics II
Q 40.6: Poster
Mittwoch, 8. März 2017, 17:00–19:00, P OG2
Quantum Phases in an Extended Bose-Hubbard Model with Global-Range Interactions — •Katrin Kröger1, Renate Landig1,2, Lorenz Hruby1, Nishant Dogra1, Manuele Landini1, Rafael Mottl1, Tobias Donner1, and Tilman Esslinger1 — 1Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland — 2Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
Quantum simulations with ultracold atoms have for a long time been limited to short-range collisional interactions, as long-range interactions have proven to be difficult to implement. Here, we experimentally realize an extended Bose-Hubbard model with long-range interactions using an atomic quantum gas trapped in a three-dimensional optical lattice and coupled to a single mode of a high finesse optical cavity. The strength of the short-range on-site interactions is controlled through the optical lattice depth. The vacuum mode of the cavity mediates a global-range interaction in the presence of a transverse laser beam. The corresponding strength can be tuned by shifting the frequency of the cavity resonance with respect to the frequency of the transverse pump beam. The interplay of tunneling, short- and global-range interactions leads to a rich phase diagram. We observe the appearance of four distinct phases, namely a superfluid, a supersolid, a Mott insulator and a charge density wave.