Detecting the Amplitude Mode of Strongly Interacting Lattice Bosons by Bragg Scattering

Details Detecting the Amplitude Mode of Strongly Interacting Lattice Bosons by Bragg Scattering Detecting the Amplitude Mode of Strongly Interacting Lattice Bosons by Bragg Scattering

2010-10-11

arxiv.org/abs/1010.2205v2

Phys. Rev. Lett. 106, 205303 (2011)

Physics

Condensed Matter

Quantum Gases

4 pages + 3 pages appendix, 3 + 2 figures

Scientific paper

10.1103/PhysRevLett.106.205303

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.

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