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

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.

4 pages + 3 pages appendix, 3 + 2 figures

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• Chiral Bosonic Phases on the Haldane Honeycomb Lattice
• Universal Properties of the Higgs Resonance in (2+1)-Dimensional U(1) Critical Systems
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• Matter-wave scattering from interacting bosons in an optical lattice
• Probing two Higgs oscillations in a one-dimensional Fermi superfluid with Raman-type spin-orbit coupling
• Exciting the long-lived Higgs mode in superfluid Fermi gases with particle removal
• Collective Modes in the Cooperative Jahn-Teller Model: Path Integral Approach
• Finite-size scaling analysis of localization transitions in the disordered two-dimensional Bose-Hubbard model within the fluctuation operator expansion method
• Localized Higgs modes of superfluid Bose gases in optical lattices: A Guzwiller mean-field study
• Spectrum of density, spin and pairing fluctuations of an attractive two-dimensional Fermi gas
• Topological Higgs Amplitude Modes in Strongly Interacting Superfluids
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• Formation of paired phases of bosons and their excitations in a square lattice
• Finite temperature phases and excitations of bosons on a square lattice: A cluster mean field study
• Exploring kinetically induced bound states in triangular lattices with ultracold atoms: spectroscopic approach
• Energy and momentum transfer in one-dimensional trapped gases by stimulated light scattering
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• Phase Diagram and Spectral Function of the Two-Dimensional Disordered Bose-Hubbard Model: A Real-Space Dynamical Mean-Field Theory Analysis
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