München 2004 – scientific programme
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Q: Quantenoptik und Photonik
Q 18: Quantengase II
Q 18.3: Talk
Tuesday, March 23, 2004, 11:30–11:45, HS 225
Bright discrete solitons in Bose-Einstein condensates — •Veronica Ahufinger1, Anna Sanpera1, Luis Santos1, Paolo Pedri1,2, and Maciej Lewenstein1 — 1Institut für Theoretische Physik, Universität Hannover, D-30167 Hannover, Germany — 2Dipartimento di Fisica, Università di Trento and BEC-INFM, I-38050 Povo, Italy
We analyze the conditions to generate bright discrete solitons either in attractive or repulsive one-dimensional Bose-Einstein condensates under realistic experimental conditions. In the case of positive scattering length the phase imprinting method is used to reach the so called staggered configuration. In this case the generation of solitons at finite temperature has also been studied. Our results show that the typical size of the discrete soliton allows its generation even in the presence of phase fluctuations. Once generated, the mobility of these entities, established by the presence of the Peierls-Navarro barrier on one hand and the width on momentum of the soliton on the other, has been addressed. Motion in the linear region is only possible if the soliton populates a number of sites large enough to be localized in momentum space. The generation of localized structures in higher dimensions than one is also reported.