Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 6: Quantum Gases: Bosons I
Q 6.7: Vortrag
Montag, 6. März 2017, 16:00–16:15, P 204
Realization of a Bose-Hubbard model with cavity-mediated global-range interactions — •Nishant Dogra1, Renate Landig2, Lorenz Hruby1, Katrin Kröger1, Manuele Landini1, Rafael Mottl1, Ferdinand Brennecke3, Sebastian Huber4, Tobias Donner1, and Tilman Esslinger1 — 1HPF D4, Quantum Optics Group, Institute for Quantum Electronics, ETH Zurich,Otto-Stern-Weg-1,Zurich-8093 — 2Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA — 3Physikalisches Institut, Universität Bonn, Wegelerstrasse 8, Bonn-53115 — 4HIT K 23.4, Institute for Theoretical Physics, ETH Zurich, Wolfgang-Pauli-Strasse 27, Zurich-8093
We experimentally realize a lattice model with cavity-mediated global-range interactions using a Bose-Einstein condensate (BEC). The global-range interactions are created by coupling the BEC to a single mode of a high-finesse cavity and illuminating it with a transverse laser-field. Their strength can be controlled by tuning the relative frequency of the transverse laser and the cavity. The presence of three competing energy scales- tunnelling, short-range interactions and global-range interactions gives rise to a rich phase diagram. We observe four different phases- a superfluid, a supersolid, a Mott insulator and a charge density wave. We also theoretically investigate the various features of our system within a mean-field framework which provides more insight about the nature of transitions between different phases.