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Excitations of Bose-Einstein condensates in a one-dimensional periodic potential
2009
Physical Review A. Atomic, Molecular, and Optical Physics
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We report on the experimental investigation of the response of a three-dimensional Bose-Einstein condensate (BEC) in the presence of a one-dimensional (1D) optical lattice. By means of Bragg spectroscopy we probe the band structure of the excitation spectrum in the presence of the periodic potential. We selectively induce elementary excitations of the BEC choosing the transferred momentum and we observe different resonances in the energy transfer, corresponding to the transitions to different
doi:10.1103/physreva.79.043623
fatcat:inpiq6yhd5bq7ierjakegtt6qe