Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 14: Quantengase: Bosonen 2
Q 14.3: Talk
Monday, March 12, 2012, 17:00–17:15, V47.02
Inter-site effects of dipolar interactions in Bose-Einstein condenates in deep optical lattices — Kazimierz Łakomy1, Rejish Nath2,3, and •Luis Santos1 — 1Institut für Theoretische Physik , Leibniz Universität, Hannover, Appelstrasse 2, D-30167, Hannover, Germany — 2Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Strasse 38, D-01187 Dresden, Germany — 3IQOQI and Institute for Theoretical Physics, University of Innsbruck, A-6020 Innsbruck, Austria
Contrary to the non-dipolar case, polar lattice gases are characterized by significant nonlocal inter-site interactions that result in a rich variety of novel physical phenomena. In this talk we show that these inter-site interactions strongly modify the nonlinear physics of a dipolar Bose-Einstein condensate in an optical lattice even in the absence of hopping. First, we report that the destabilization of a dipolar condensate confined in a two-dimensional optical lattice may be followed by correlated modulational instability that evolves spontaneously into soliton filaments or into a checkerboard soliton crystal. Moreover, we will discuss the possibility of forming various types of inter-site soliton molecules (dimers, trimers, etc). Finally we will show how the analysis of Faraday patterns may allow for the experimental study of the collective excitations spectrum shared by non-overlapping sites.