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 bosonic 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. © 2011 American Physical Society.
CITATION STYLE
Bissbort, U., Götze, S., Li, Y., Heinze, J., Krauser, J. S., Weinberg, M., … Hofstetter, W. (2011). Detecting the amplitude mode of strongly interacting lattice bosons by Bragg scattering. Physical Review Letters, 106(20). https://doi.org/10.1103/PhysRevLett.106.205303
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