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

References in corpus (12)

• Many-Body Physics with Ultracold Gases
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Bragg spectroscopy of a strongly interacting 85Rb Bose-Einstein condensate
• Mott insulator to superfluid transition in the Bose-Hubbard model: a strong-coupling approach
• Dynamical properties of ultracold bosons in an optical lattice
• Exploring correlated 1D Bose gases from the superfluid to the Mott-insulator state by inelastic light scattering
• Spectral weight redistribution in strongly correlated bosons in optical lattices
• Excitation spectra of strongly correlated lattice bosons and polaritons
• The Amplitude Mode in the Quantum Phase Model
• Interacting Bose gases in quasi-one dimensional optical lattices
• Deconfinement in a 2D optical lattice of coupled 1D boson systems
• Bragg spectroscopy of trapped one dimensional strongly interacting bosons in optical lattices: Probing the cake-structure

Cited by in corpus (10)

• Quantum fluids of light
• The `Higgs' Amplitude Mode at the Two-Dimensional Superfluid-Mott Insulator Transition
• Characterization of Mott-insulating and superfluid phases in the one-dimensional Bose--Hubbard model
• Higgs amplitude mode in the vicinity of a $(2+1)$-dimensional quantum critical point: a nonperturbative renormalization-group approach
• Universal Properties of the Higgs Resonance in (2+1)-Dimensional U(1) Critical Systems
• Rigorous mean-field dynamics of lattice bosons: Quenches from the Mott insulator
• Generating Functional Approach for Spontaneous Coherence in Semiconductor Electron-Hole-Photon Systems
• Matter-wave scattering from interacting bosons in an optical lattice
• Collective Modes in the Cooperative Jahn-Teller Model: Path Integral Approach
• Energy and momentum transfer in one-dimensional trapped gases by stimulated light scattering