Stuttgart 2012 – wissenschaftliches Programm
Q 32.2: Vortrag
Dienstag, 13. März 2012, 14:30–14:45, V7.02
Confinement-Induced collapse of a dipolar Bose-Einstein Condensate in an optical lattice — •Emanuel Henn1, Juliette Billy1, Stefan Müller1, Holger Kadau1, Thomas Maier1, Mathias Schmitt1, Mattia Jona-Lasinio2, Luis Santos2, Axel Griesmaier1, and Tilman Pfau1 — 15.Physikalisches Institut, Universitat Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2Institut fur Theoretische Physik, Leibniz Universitat Hannover, 30167 Hannover, Germany
We experimentally investigate the collapse of a dipolar Bose-Einstein Condensate (dBEC) in a 1D lattice. In contrast with the standard method of changing the contact interaction energy, the collapse is here induced by a sudden change in the confining potential. Only a dBEC offers this possibility since its stability threshold strongly depends on the lattice depth due to the anisotropic character of the dipolar interaction . For shallow lattices, in the extreme case where the trapping potential is completely switched off, the dBEC collapses during the free expansion, which is also a unique feature of dipolar systems. For deep lattices, structured ground-states are expected to appear. However, strong atom losses and dephasing effects restrict the experimental parameter range. We present here our methods to overcome these limitations and discuss preliminary results.
 S. Müller et al., Phys. Rev. A 84, 053601 (2011)