Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 15: Ultra-cold atoms, ions and BEC III (with Q)

A 15.5: Vortrag

Mittwoch, 16. März 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 Mueller^1,2, 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.