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Bragg spectroscopy of a superfluid Bose-Hubbard gas

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arxiv 0704.2623 v2 pith:Y655UT2V submitted 2007-04-19 cond-mat.other

X. Du , Shoupu Wan , Emek Yesilada , C. Ryu , D. J. Heinzen , Z. X. Liang , Biao Wu This is my paper
classification cond-mat.other
keywords latticebose-hubbardbraggdecreasemeasurementsopticalresonantspectroscopy
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Bragg spectroscopy is used to measure excitations of a trapped, quantum-degenerate gas of 87Rb atoms in a 3-dimensional optical lattice. The measurements are carried out over a range of optical lattice depths in the superfluid phase of the Bose-Hubbard model. For fixed wavevector, the resonant frequency of the excitation is found to decrease with increasing lattice depth. A numerical calculation of the resonant frequencies based on Bogoliubov theory shows a less steep rate of decrease than the measurements.

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