Hannover 2003 – wissenschaftliches Programm
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Q: Quantenoptik
Q 41: Quantengase 4
Q 41.4: Vortrag
Donnerstag, 27. März 2003, 14:45–15:00, E001
Dynamic structure factor of a Bose-Einstein condensate in a 1D optical lattice — •Meret Krämer1, Chiara Menotti1,2, Lev Pitaevskii1,3, and Sandro Stringari1 — 1Dipartimento di Fisica, Università di Trento and BEC-INFM,I-38050 Povo, Italy — 2Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy — 3Kapitza Institute for Physical Problems, ul. Kosygina 2, 117334 Moscow, Russia
We study the effect of a one dimensional periodic potential on the dynamic structure factor of an interacting Bose-Einstein condensate at zero temperature. We show that, due to phononic correlations, the excitation strength towards the first band develops a typical oscillating behaviour as a function of the momentum transfer, and vanishes at even multiples of the Bragg momentum. The effects of interactions on the static structure factor are found to be significantly amplified by the presence of the optical potential. Our predictions can be tested in stimulated photon scattering experiments.