Detecting the Amplitude Mode of Strongly Interacting Lattice Bosons by Bragg Scattering
Quantum Gases
2011-06-01 v2
Abstract
We report the first detection of the Higgs-type amplitude mode using Bragg spectroscopy in a strongly interacting condensate of ultracold atoms in an optical lattice. By the comparison of our experimental data with a spatially resolved, time-dependent dynamic Gutzwiller calculation, we obtain good quantitative agreement. This allows for a clear identification of the amplitude mode, showing that it can be detected with full momentum resolution by going beyond the linear response regime. A systematic shift of the sound and amplitude modes' resonance frequencies due to the finite Bragg beam intensity is observed.
Keywords
Cite
@article{arxiv.1010.2205,
title = {Detecting the Amplitude Mode of Strongly Interacting Lattice Bosons by Bragg Scattering},
author = {U. Bissbort and S. Götze and Y. Li and J. Heinze and J. S. Krauser and M. Weinberg and C. Becker and K. Sengstock and W. Hofstetter},
journal= {arXiv preprint arXiv:1010.2205},
year = {2011}
}
Comments
4 pages + 3 pages appendix, 3 + 2 figures