Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 20: Ultra-cold atoms, ions and BEC V (with Q)
A 20.5: Vortrag
Donnerstag, 17. März 2011, 11:30–11:45, BAR 106
Definite angular momentum and fragmentation in 3D attractive BECs — •Marios C. Tsatsos1, Alexej I. Streltsov1, Ofir E. Alon1,2, and Lorenz S. Cederbaum1 — 1Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany — 2Department of Physics, University of Haifa at Oranim, Tivon 36006, Israel
We consider a 3D Bose-Einstein Condensate (BEC), with attractive interparticle interactions, embedded in a harmonic, spherically symmetric trap. This system is metastable only if the total number of bosons N and the interaction strength λ0 do not exceed some critical values. Otherwise the system collapses. The Gross-Pitaevskii (GP) theory predicts the maximum (critical) number of bosons NcrGP that, for a given λ0, can be loaded to the ground state of the system, without its collapse. But, what happens to the excited states? To investigate the structure and stability of these states we must go beyond GP theory; the excited states have definite values of angular momentum L, are highly fragmented and can support number of bosons much greater than NcrGP.