Density Fluctuations across the Superfluid-Supersolid Phase Transition in a Dipolar Quantum Gas
arXiv:2009.08910 · doi:10.1103/PhysRevX.11.011037
Abstract
Phase transitions share the universal feature of enhanced fluctuations near the transition point. Here we show that density fluctuations reveal how a Bose-Einstein condensate of dipolar atoms spontaneously breaks its translation symmetry and enters the supersolid state of matter -- a phase that combines superfluidity with crystalline order. We report on the first direct in situ measurement of density fluctuations across the superfluid-supersolid phase transition. This allows us to introduce a general and straightforward way to extract the static structure factor, estimate the spectrum of elementary excitations and image the dominant fluctuation patterns. We observe a strong response in the static structure factor and infer a distinct roton minimum in the dispersion relation. Furthermore, we show that the characteristic fluctuations correspond to elementary excitations such as the roton modes, which have been theoretically predicted to be dominant at the quantum critical point, and that the supersolid state supports both superfluid as well as crystal phonons.
arXiv comment11 pages, 5 + 3 figures
References in corpus (62)
- Feshbach Resonances in Ultracold Gases
- Quantum many-body systems out of equilibrium
- Bragg spectroscopy of a Bose-Einstein condensate
- Observation of quantum droplets in a strongly dipolar Bose gas
- Observing the Rosensweig instability of a quantum ferrofluid
- Roton-maxon spectrum and stability of trapped dipolar condensates
- Spatial quantum noise interferometry in expanding ultracold atom clouds
- Observation of a dipolar quantum gas with metastable supersolid properties
- Excitation of phonons in a Bose-Einstein condensate by light scattering
- Transient supersolid properties in an array of dipolar quantum droplets
- Supersolids: what and where are they ?
- Long-lived and transient supersolid behaviors in dipolar quantum gases
- Universality of Phase Transition Dynamics: Topological Defects from Symmetry Breaking
- Ultracold atoms out of equilibrium
- Roton-type mode softening in a quantum gas with cavity-mediated long-range interactions
- Spatial coherence and density correlations of trapped Bose gases
- Observation of scale invariance and universality in two-dimensional Bose gases
- Supersolid symmetry breaking from compressional oscillations in a dipolar quantum gas
- Quantum Fluctuations in Dipolar Bose Gases
- The low-energy Goldstone mode in a trapped dipolar supersolid
- Observation of Roton Mode Population in a Dipolar Quantum Gas
- Excitation spectrum of a trapped dipolar supersolid and its experimental evidence
- New states of matter with fine-tuned interactions: quantum droplets and dipolar supersolids
- Quantum phase transition in a two-dimensional system of dipoles
- Ground-state phase diagram of a dipolar condensate with quantum fluctuations
- Ground state and elementary excitations of single and binary Bose-Einstein condensates of trapped dipolar gases
- Observations of density fluctuations in an elongated Bose gas: ideal gas and quasi-condensate regimes
- Universal behavior of pair correlations in a strongly interacting Fermi gas
- Beyond Mean-Field Low-Lying Excitations of Dipolar Bose Gases
- Sub-Poissonian fluctuations in a 1D Bose gas: from the quantum quasi-condensate to the strongly interacting regime
- Bogoliubov modes of a dipolar condensate in a cylindrical trap
- Bragg spectroscopy of a strongly interacting Fermi gas
- From Cosmology to Cold Atoms: Observation of Sakharov Oscillations in Quenched Atomic Superfluids
- Probing the roton excitation spectrum of a stable dipolar Bose gas
- Dilute dipolar quantum droplets beyond the extended Gross-Pitaevskii equation
- Dynamic structure factor and momentum distribution of a trapped Bose gas
- Supersolid behaviour of a dipolar Bose-Einstein condensate confined in a tube
- Probing three-body correlations in a quantum gas using the measurement of the third moment of density fluctuations
- Striped states in a many-body system of tilted dipoles
- Collective excitations of self-bound droplets of a dipolar quantum fluid
- Measuring the dynamic structure factor of a quantum gas undergoing a structural phase transition
- Extracting density-density correlations from in situ images of atomic quantum gases
- Causality and non-equilibrium second-order phase transitions in inhomogeneous systems
- s-wave scattering lengths of the strongly dipolar bosons Dy and Dy
- Anisotropic excitation spectrum of a dipolar quantum Bose gas
- Roton spectroscopy in a harmonically trapped dipolar Bose-Einstein condensate
- Ground-state properties of a one-dimensional system of dipoles
- The discovery of superfluidity
- The Fate of the Higgs Mode in a Trapped Dipolar Supersolid
- Instabilities and the roton spectrum of a quasi-1D Bose-Einstein condensed gas with dipole-dipole interactions
- Density oscillations in trapped dipolar condensates
- Universal Thermometry for Quantum Simulation
- Patterned Supersolids in Dipolar Bose Systems
- Anisotropic expansion of a thermal dipolar Bose gas
- Local atom-number fluctuations in quantum gases at finite temperature
- Variational theory for the ground state and collective excitations of an elongated dipolar condensate
- Monitoring squeezed collective modes of a one-dimensional Bose gas after an interaction quench using density ripples analysis
- Imaging the collective excitations of an ultracold gas using statistical correlations
- Depletion and fluctuations of a trapped dipolar Bose-Einstein condensate in the roton regime
- Excitations and number fluctuations in an elongated dipolar Bose-Einstein condensate
- Observing atom bunching by the Fourier slice theorem
- Density ripples in expanding low-dimensional gases as a probe of correlations
Cited by in corpus (46)
- Dipolar physics: A review of experiments with magnetic quantum gases
- Long-range interacting quantum systems
- Pattern Formation in Quantum Ferrofluids: from Supersolids to Superglasses
- Birth, life, and death of a dipolar supersolid
- Phases of supersolids in confined dipolar Bose-Einstein condensates
- Roton Excitations in an Oblate Dipolar Quantum Gas
- Crystallization of Bosonic Quantum Hall States
- Self-bound dipolar droplets and supersolids in molecular Bose-Einstein condensates
- Supersolidity in Two-Dimensional Trapped Dipolar Droplet Arrays
- Out-of-equilibrium dynamics of quantum many-body systems with long-range interactions
- Dimensional crossover in the superfluid-supersolid quantum phase transition
- Probing Lorentz-Invariance-Violation Induced Nonthermal Unruh Effect in Quasi-Two-Dimensional Dipolar Condensates
- Vortices in dipolar Bose-Einstein condensates
- Control of Dy Bose-Einstein condensate phases and dynamics with dipolar anisotropy
- Metastable Patterns in one- and two-component dipolar Bose-Einstein Condensates
- Compressibility and speeds of sound across the superfluid to supersolid phase transition of an elongated dipolar gas
- Excitations of a two-dimensional supersolid
- Supersolid Stacks in Antidipolar Bose-Einstein Condensates
- Multi-frequency optical lattice for dynamic lattice-geometry control
- Excitations of a binary dipolar supersolid
- Decoupled sound and amplitude modes in trapped dipolar supersolids
- Universal relations for dipolar quantum gases
- Spin rotons and supersolids in binary antidipolar condensates
- Sounds waves and fluctuations in one-dimensional supersolids
- Supersolid formation in a dipolar condensate by roton instability
- Striped Ultradilute Liquid of Dipolar Bosons in Two Dimensions
- A Python GPU-accelerated solver for the Gross-Pitaevskii equation and applications to many-body cavity QED
- Coupled system of electrons and exciton-polaritons: Screening, dynamical effects, and superconductivity
- Supersolidity in Rydberg tweezer arrays
- Nonlocal field theory of quasiparticle scattering in dipolar Bose-Einstein condensates
- Estimation of the condensate fraction from the static structure factor
- A quantum Monte Carlo based density functional for Dysprosium dipolar system
- Signatures of rigidity and second sound in dipolar supersolids
- Josephson vortices and persistent current in a double-ring supersolid system
- Phase-induced vortex pinning in rotating supersolid dipolar systems
- Formation of paired phases of bosons and their excitations in a square lattice
- Creating and melting a supersolid by heating a quantum dipolar system
- Reflections on dipolar quantum fluids
- Long lifetime supersolid in a two-component dipolar Bose-Einstein condensate
- Density engineering via inter-condensate dipole-dipole interactions
- Evolution of density variations in a trapped atomic superfluid driven into turbulence
- Finite temperature phases and excitations of bosons on a square lattice: A cluster mean field study
- Quasiparticle spectra of mixtures of dipolar and non-dipolar condensates at zero and finite temperatures
- Strongly dipolar molecular Bose-Einstein condensates: From few- to many-body physics
- Excitations and anisotropic sound in planar dipolar supersolids with tilted dipoles
- Optical response of the supersolid polaron