Bragg spectroscopy of a superfluid Bose-Hubbard gas
Other Condensed Matter
2015-05-13 v2
Abstract
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.
Keywords
Cite
@article{arxiv.0704.2623,
title = {Bragg spectroscopy of a superfluid Bose-Hubbard gas},
author = {X. Du and Shoupu Wan and Emek Yesilada and C. Ryu and D. J. Heinzen and Z. X. Liang and Biao Wu},
journal= {arXiv preprint arXiv:0704.2623},
year = {2015}
}
Comments
11 pages, 4 figures