Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 27: Ultra-cold atoms, ions and BEC III
Q 27.5: Talk
Wednesday, March 16, 2011, 11:45–12:00, BAR 106
Stability and elementary excitations of a dipolar Bose gas in a 1D optical lattice — •Mattia Jona - Lasinio1, Luis Santos1, Stefan Mueller1,2, Juliette Billy2, Emanuel Henn2, Holger Kadau2, Philipp Weinmann2, David Peter2, and Tilman Pfau2 — 1ITP, Institut für Theoretische Physik, Leibniz Universität Hannover — 25. Physikalisches Institut, Universität Stuttgart
We consider a system of ultracold dipolar bosons in a 3D harmonic potential plus a 1D optical lattice along the weakest trapping direction. We assume all dipoles to be aligned along the lattice direction. We investigate the stability of the system as a function of the lattice strength and we highlight the role played by the long range dipole-dipole interaction. By solving the Bogoliubov equations we also characterize the different types of instability emerging in the system. We compare our theoretical predictions with the stability of a Chromium (52Cr) condensate, finding the experimental evidence of the dipole-dipole long range character.