Bragg spectroscopy of a cigar shaped Bose condensate in optical lattices

Details Bragg spectroscopy of a cigar shaped Bose condensate in optical lattices Bragg spectroscopy of a cigar shaped Bose condensate in optical lattices

2006-11-13

arxiv.org/abs/cond-mat/0611312v2

Journal of Physics B: Atomic, Molecular & Optical Physics 40, 2587 (2007)

Physics

Condensed Matter

Other Condensed Matter

7 pages, 5 figures, to appear in Journal of Physics B: Atomic, Molecular & Optical Physics

Scientific paper

10.1088/0953-4075/40/13/005

We study properties of excited states of an array of weakly coupled quasi-two-dimensional Bose condensates by using the hydrodynamic theory. We calculate multibranch Bogoliubov-Bloch spectrums and its corresponding eigenfunctions. The spectrum of the axial excited states and its eigenfunctions strongly depends on the coupling among various discrete radial modes within a given symmetry. This mode coupling is due to the presence of radial trapping potential. The multibranch nature of the Bogoliubov-Bloch spectrum and its dependence on the mode-coupling can be realized by analyzing dynamic structure factor and momentum transferred to the system in Bragg spectroscopy experiments. We also study dynamic structure factor and momentum transferred to the condensate due to the Bragg spectroscopy experiment.

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