High-energy Bragg scattering measurements of a dipolar supersolid

Abstract

We present an experimental and theoretical study of the high-energy excitation spectra of a dipolar supersolid. Using Bragg spectroscopy, we study the scattering response of the system to a high-energy probe, enabling measurements of the dynamic structure factor. We experimentally observe a continuous reduction of the response when tuning the contact interaction from an ordinary Bose-Einstein condensate to a supersolid state. Yet the observed reduction is faster than the one theoretically predicted by the Bogoliubov-de-Gennes theory. Based on an intuitive semi-analytic model and real-time simulations, we primarily attribute such a discrepancy to the out-of-equilibrium phase dynamics, which although not affecting the system global coherence, reduces its response.

13 pages, 4+10 figures

References in corpus (14)

• Many-Body Physics with Ultracold Gases
• Quantum-fluctuation-driven crossover from a dilute Bose-Einstein condensate to a macro-droplet in a dipolar quantum fluid
• Dynamics and statistical mechanics of ultra-cold Bose gases using c-field techniques
• Transient supersolid properties in an array of dipolar quantum droplets
• Long-lived and transient supersolid behaviors in dipolar quantum gases
• Bragg spectroscopy of a strongly interacting 85Rb Bose-Einstein condensate
• Bogoliubov modes of a dipolar condensate in a cylindrical trap
• Supersolidity around a critical point in dipolar Bose Einstein condensates
• Striped states in a many-body system of tilted dipoles
• Precise determination of the structure factor and contact in a unitary Fermi gas
• Evidence of superfluidity in a dipolar supersolid from non-classical rotational inertia
• Supersolidity in an elongated dipolar condensate
• Deep inelastic scattering on ultracold gases
• Probing the supersolid order via high-energy scattering: analytical relations among response, density modulation, and superfluid fraction

Cited by in corpus (32)

• Dipolar physics: A review of experiments with magnetic quantum gases
• Two-Dimensional Supersolid Formation in Dipolar Condensates
• Dimensional crossover in the superfluid-supersolid quantum phase transition
• Exciting the Goldstone Modes of a Supersolid Spin-Orbit-Coupled Bose Gas
• Supersolidity and crystallization of a dipolar Bose gas in an infinite tube
• Dynamics of Stripe Patterns in Supersolid Spin-Orbit-Coupled Bose Gases
• Elementary excitations in a spin-orbit-coupled spin-1 Bose-Einstein condensate
• Infinite dipolar droplet -- a simple theory for the macro-droplet regime
• Ground-state stability and excitation spectrum of a one-dimensional dipolar supersolid
• Compressibility and speeds of sound across the superfluid to supersolid phase transition of an elongated dipolar gas
• Excitations of a two-dimensional supersolid
• Excitations of a binary dipolar supersolid
• Sounds waves and fluctuations in one-dimensional supersolids
• Supersolid formation in a dipolar condensate by roton instability
• Metastable supersolid in spin-orbit coupled Bose-Einstein condensates
• Stability of a flattened dipolar binary condensate: emergence of the spin roton
• Crossing the superfluid-supersolid transition of an elongated dipolar condensate
• Oscillations of a quasi-one-dimensional dipolar supersolid
• Nonlocal field theory of quasiparticle scattering in dipolar Bose-Einstein condensates
• Supersolid spectroscopy
• Honeycomb supersolid -- Dirac points and shear-instability induced crystal transitions
• Anomalous dispersion of shear waves in dipolar supersolids
• Excitations and phase ordering of the spin-stripe phase of a binary dipolar condensate
• Phase-induced vortex pinning in rotating supersolid dipolar systems
• Rotons and their damping in elongated dipolar Bose-Einstein condensates
• Roadmap to vortex nucleation below critical rotation frequency in a dipolar Bose-Einstein condensate
• ${\mathbb{Z}}_n$ symmetry broken supersolid in spin-orbit-coupled Bose-Einstein condensates
• Localized States in Dipolar Bose-Einstein Condensates: To be or not to be of second order
• Long lifetime supersolid in a two-component dipolar Bose-Einstein condensate
• Dynamical signatures of superfluidity and shear rigidity in different phases of a dipolar Bose-Einstein condensate
• Supersolid phase of a spin-orbit-coupled Bose-Einstein condensate: a perturbation approach
• Excitations and anisotropic sound in planar dipolar supersolids with tilted dipoles