Excitations of a Superfluid in a 3D Optical Lattice

Abstract

We prepare a Bose-Einstein condensed gas in a three-dimensional optical lattice and study the excitation spectrum of the superfluid phase for different interaction strengths. We probe the response of the system by modulating the depth of the optical lattice along one axis. The interactions can be controlled independently by varying the tunnel coupling along the other two lattice axes. In the weakly interacting regime we observe a small susceptibility of the superfluid to excitations, while for stronger interactions an unexpected resonance appears in the excitation spectrum. In addition we measure the coherent fraction of the atomic gas, which determines the depletion of the condensate.

arXiv comment4 pages, 4 figures

References in corpus (12)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Cold bosonic atoms in optical lattices
• Transition from a strongly interacting 1D superfluid to a Mott insulator
• Josephson Junction Arrays with Bose-Einstein Condensates
• Bragg spectroscopy of a Bose-Einstein condensate
• Exploring phase coherence in a 2D lattice of Bose-Einstein condensates
• Exciting Collective Oscillations in a Trapped 1D Gas
• Phases of the one-dimensional Bose-Hubbard model
• Interference of an array of independent Bose-Einstein condensates
• Phase diagram of the bose Hubbard model
• Bose-Einstein condensates in 1D optical lattices: compressibility, Bloch bands and elementary excitations
• Dynamic structure factor of a Bose Einstein condensate in a 1D optical lattice

Cited by in corpus (93)

• Many-Body Physics with Ultracold Gases
• Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
• Tools for quantum simulation with ultracold atoms in optical lattices
• Amplitude / Higgs Modes in Condensed Matter Physics
• A lattice of double wells for manipulating pairs of cold atoms
• Evidence for Superfluidity of Ultracold Fermions in an Optical Lattice
• The `Higgs' Amplitude Mode at the Two-Dimensional Superfluid-Mott Insulator Transition
• Numerical observation of Hawking radiation from acoustic black holes in atomic Bose-Einstein condensates
• Hidden order in 1D Bose insulators
• An acoustic analog to the dynamical Casimir effect in a Bose-Einstein condensate
• Momentum-Resolved Bragg Spectroscopy in Optical Lattices
• Visibility of the Amplitude (Higgs) Mode in Condensed Matter
• Phase coherence of an atomic Mott insulator
• Controlling Correlated Tunneling and Superexchange Interactions with AC-Driven Optical Lattices
• Dynamical properties of ultracold bosons in an optical lattice
• Prethermal Floquet Steady States and Instabilities in the Periodically Driven, Weakly Interacting Bose-Hubbard Model
• Linear response theory for a pair of coupled one-dimensional condensates of interacting atoms
• Detecting the Amplitude Mode of Strongly Interacting Lattice Bosons by Bragg Scattering
• Faraday waves in Bose-Einstein condensates
• Density correlations and dynamical Casimir emission of Bogoliubov phonons in modulated atomic Bose-Einstein condensates
• Excitations of optically driven atomic condensate in a cavity: theory of photodetection measurements
• Entanglement in a periodic quench
• Extended Coherence Time with Atom-Number Squeezed Sources
• The Amplitude Mode in the Quantum Phase Model
• Disordered ultracold atomic gases in optical lattices: A case study of Fermi-Bose mixtures
• Parametric excitation of a Bose-Einstein condensate in a 1D optical lattice
• Stability diagram and growth rate of parametric resonances in Bose-Einstein condensates in one-dimensional optical lattices
• Supersymmetry and Goldstino-like Mode in Bose-Fermi Mixtures
• Sodium Bose-Einstein Condensates in an Optical Lattice
• Observation of Massless and Massive Collective Excitations with Faraday Patterns in a Two-Component Superfluid
• Wavepacket dynamics in energy space of a chaotic trimeric Bose-Hubbard system
• Energy absorption of a Bose gas in a periodically modulated optical lattice
• Spectroscopy for cold atom gases in periodically phase-modulated optical lattices
• Mean-field phase diagram of cold lattice bosons in disordered potentials
• Evidence of Potts-Nematic Superfluidity in a Hexagonal $s{p}^2$ Optical Lattice
• Gaussian time dependent variational principle for the Bose-Hubbard model
• Echo-Ramsey Interferometry with Motional Quantum States
• Excitations of Bose-Einstein condensates in a one-dimensional periodic potential
• Techniques to measure quantum criticality in cold atoms
• Dynamically generated flat-band phases in optical kagome lattices
• Theory of correlations between ultra-cold bosons released from an optical lattice
• Ultracold Superstrings in atomic boson-fermion mixtures
• Superfluid-Insulator transition of two-species bosons with spin-orbit coupling
• Bragg spectroscopy of a superfluid Bose-Hubbard gas
• Quantum phases in a resonantly-interacting Bose-Fermi mixture
• Schwinger-Keldysh approach to out of equilibrium dynamics of the Bose Hubbard model with time varying hopping
• Floquet engineering of individual band gaps in an optical lattice using a two-tone drive
• Momentum-Resolved and Correlations Spectroscopy Using Quantum Probes
• Finite temperature theory of superfluid bosons in optical lattices
• Bose Hubbard model in the presence of Ohmic dissipation
• Theory of Ultracold Superstrings
• An exact one-particle theory of bosonic excitations: From a generalized Hohenberg-Kohn theorem to convexified N-representability
• Dynamics of matter-wave solitons in a time-modulated two-dimensional optical lattice
• Interaction Spectroscopy of a Two-component Mott Insulator
• Caustics in quantum many-body dynamics
• Bose - Einstein Condensate Superfluid-Mott Insulator Transition in an Optical Lattice
• Ground state phase diagram of the 2d Bose-Hubbard model with anisotropic hopping
• Resonant excitations of a Bose Einstein condensate in an optical lattice
• Finite-temperature properties of quasi-2D Bose-Einstein condensates
• Effects of dissipation on the superfluid-Mott-insulator transition of photons
• Raman Spectroscopy of Mott insulator states in optical lattices
• Circuit complexity near critical points
• Relaxation of a Goldstino-like mode due to supersymmetry breaking in Bose-Fermi mixtures
• Oscillations of Bose condensates in a one-dimensional optical superlattice
• Momentum Resolved Optical Lattice Modulation Spectroscopy for Bose Hubbard Model
• Contour-time approach to the Bose-Hubbard model in the strong coupling regime: Studying two-point spatio-temporal correlations at the Hartree-Fock-Bogoliubov level
• Atomic lattice excitons: from condensates to crystals
• Metastable Bose-Einstein Condensation in a Strongly Correlated Optical Lattice
• Studies of bosons in optical lattices in a harmonic potential
• Energy absorption spectroscopy of unitary Fermi gases in a uniform potential
• Calculation of collective modes for the Bose-Hubbard model with confinement
• Phase-controlled localization and directed transport in a bipartite lattice
• Bose-Einstein condensation in tight-binding bands
• Probing the Superfluid - Mott Insulating Shell Structure of Cold Atoms by Parametric Excitations
• Finite temperature coherence of the ideal Bose gas in an optical lattice
• Thermodynamics of quantum degenerate gases in optical lattices
• Lattice bosons in quartic confinement
• Collapse and revival of oscillations in a parametrically excited Bose-Einstein condensate in combined harmonic and optical lattice trap
• Phase diagram of 1+1D Abelian-Higgs model and its critical point
• Calorimetry of Bose-Einstein condensates
• Mott insulator dynamics
• Controlled quantum stirring of Bose-Einstein condensates
• Resonant scattering effect in spectroscopies of interacting atomic gases
• Many-Body Formation and Dissociation of a Dipolar Chain Crystal
• Two-step condensation of lattice bosons
• Kink Dynamics in a Non-Autonomous Sine-Gordon Model
• Global and local condensate and superfluid fraction of a few hard core bosons in a cubic optical lattice plus external harmonic confinement
• The influence of sublattice bias on superfluid to Mott insulator transitions
• Time dependent local potential in a Tomonaga-Luttinger liquid
• Exploring kinetically induced bound states in triangular lattices with ultracold atoms: spectroscopic approach
• Parametric Resonance in the Non-Autonomous Sine-Gordon Model
• Analogue gravitational phenomena in Bose-Einstein condensates
• Ground-state and Excitation spectra of Bose-Fermi Mixtures in a Three-Dimensional Optical Lattice