Detecting the amplitude mode of strongly interacting lattice bosons by Bragg scattering.
نویسندگان
چکیده
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.
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عنوان ژورنال:
- Physical review letters
دوره 106 20 شماره
صفحات -
تاریخ انتشار 2011