Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 31: Quantum Gases: Interaction Effects II

Q 31.8: Talk

Wednesday, March 10, 2010, 15:45–16:00, E 001

Phonon instability and structured ground-states in multi-layer stacks of dipolar Bose-Einstein condensates — •Patrick Köberle and Günter Wunner — 1. Institut für Theoretische Physik, Universität Stuttgart, 70550 Stuttgart

Dipolar interactions between atoms in ultra-cold quantum gases are long-ranged and anisotropic. The latter feature is responsible for a wealth of effects studied in single condensates both theoretically and experimentally. The long-range nature, however, makes it possible to couple individual condensates trapped in deep optical lattices. We study the ground-state of a stack of condensates aligned in the direction of the polarization axis [1] and find a strong dependence of the phonon instability on the number of condensates, which is a direct consequence of the long-range nature of the dipole-dipole interaction. Moreover, in the very vicinity of the phonon instability, we find several types of structures in the density distribution of the atoms.

[1] P. Köberle and G. Wunner, Phys. Rev. A 80, 063601 (2009)