Bragg spectroscopy of a superfluid Bose-Hubbard gas

Details Bragg spectroscopy of a superfluid Bose-Hubbard gas Bragg spectroscopy of a superfluid Bose-Hubbard gas

2007-04-19

arxiv.org/abs/0704.2623v2

Physics

Condensed Matter

Other Condensed Matter

11 pages, 4 figures

Scientific paper

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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