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Collective excitation of Bose-Einstein condensates in the transition region between 3D and 1D

Collective excitation of Bose-Einstein condensates in the transition region between 3D and 1D,10.1103/PhysRevA.72.053631,M. Kottke,T. Schulte,L. Cacci

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Collective excitation of Bose-Einstein condensates in the transition region between 3D and 1D  
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We measure the frequency of the low m=0 quadrupolar excitation mode of weakly interacting Bose-Einstein condensates in the transition region from the 3D to the 1D mean-field regime. Various effects shifting the frequency of the mode are discussed. In particular we take the dynamic coupling of the condensate with the thermal component at finite temperature into account using a time-dependent Hartree-Fock-Bogoliubov treatment developed in [S. Giorgini, Phys. Rev. A 61, 063615 (2000)]. We show that the frequency rises in the transition from 3D to 1D, in good agreement with the theoretical prediction [C. Menotti and S. Stringari, Phys. Rev. A 66, 043610 (2002)].
Published in 2005.
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