Bragg spectroscopy of a superfluid Bose-Hubbard gas

Abstract

Bragg spectroscopy is used to measure excitations of a trapped, quantum-degenerate gas of 87Rb atoms in a 3-dimensional optical lattice. The measurements are carried out over a range of optical lattice depths in the superfluid phase of the Bose-Hubbard model. For fixed wavevector, the resonant frequency of the excitation is found to decrease with increasing lattice depth. A numerical calculation of the resonant frequencies based on Bogoliubov theory shows a less steep rate of decrease than the measurements.

11 pages, 4 figures

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Cited by in corpus (21)

• Momentum-Resolved Bragg Spectroscopy in Optical Lattices
• Ultracold bosons with short-range interaction in regular optical lattices
• Characterization of Mott-insulating and superfluid phases in the one-dimensional Bose--Hubbard model
• Excitation dynamics in a lattice Bose gas within the time-dependent Gutzwiller mean-field approach
• Interaction-Enhanced Group Velocity of Bosons in the Flat Band of an Optical Kagome Lattice
• Quasiparticle dynamics in a Bose insulator probed by inter-band Bragg spectroscopy
• Optical lattice influenced geometry of quasi-2D binary condensates and quasiparticle spectra
• Momentum-Resolved and Correlations Spectroscopy Using Quantum Probes
• Visualization of Dimensional Effects in Collective Excitations of Optically Trapped Quasi-Two-Dimensional Bose Gases
• Probing the Flat Band of Optically-Trapped Spin-Orbital Coupled Bose Gases Using Bragg Spectroscopy
• Beliaev Damping in Spin-$\frac{1}{2}$ Interacting Bosons with Spin-Orbit Coupling
• Numerical calculation of spectral functions of the Bose-Hubbard model using B-DMFT
• Matter-wave scattering from interacting bosons in an optical lattice
• Light scattering in inhomogeneous Tomonaga-Luttinger liquids
• Probing Phases and Quantum Criticality using Deviations from the Local Fluctuation-Dissipation Theorem
• Probing Sound Speed of an Optically-Trapped Bose Gas with Periodically Modulated Interactions by Bragg Spectroscopy
• Hierarchical dimensional crossover of an optically-trapped quantum gas with disorder
• Interaction-Induced Dimensional Crossover through Full 3D to 1D
• Unusual behavior of sound velocity of a Bose gas in an optical superlattice at quasi-one-dimension
• Theoretical Analysis on Spectroscopy of Atomic Bose-Hubbard Systems
• Probing $p$-wave effects in spin-density separation of Bose mixtures with the dynamic structure factor