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Observation of harmonic generation and nonlinear coupling in the collective dynamics of a Bose condensate

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arxiv cond-mat/0003495 v1 pith:4CNO6LZ7 submitted 2000-03-30 cond-mat.stat-mech cond-mat.mes-hall

G. Hechenblaikner , O.M. Marago' , E. Hodby , J. Arlt , S. Hopkins , C.J. Foot This is my paper
classification cond-mat.stat-mechcond-mat.mes-hall
keywords modecouplingfrequencygenerationharmonicnonlineartrapanisotropy
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We report the observation of harmonic generation and strong nonlinear coupling of two collective modes of a condensed gas of rubidium atoms. Using a modified TOP trap we changed the trap anisotropy to a value where the frequency of the m=0 high-lying mode corresponds to twice the frequency of the m=0 low-lying mode, thus leading to strong nonlinear coupling between these modes. By changing the anisotropy of the trap and exciting the low-lying mode we observed significant frequency shifts of this fundamental mode and also the generation of its second harmonic.

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