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

C. Becker; J. Heinze; J. S. Krauser; K. Sengstock; M. Weinberg; S. G\"otze; U. Bissbort; W. Hofstetter; Y. Li

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arxiv 1010.2205 v2 pith:BVUTEIOT submitted 2010-10-11 cond-mat.quant-gas

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

U. Bissbort , S. G\"otze , Y. Li , J. Heinze , J. S. Krauser , M. Weinberg , C. Becker , K. Sengstock

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W. Hofstetter

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classification cond-mat.quant-gas

keywords amplitudebraggmodeinteractinglatticestronglyagreementallows

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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.

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

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