Anisotropic expansion of a thermal dipolar Bose gas

Abstract

We report on the anisotropic expansion of ultracold bosonic dysprosium gases at temperatures above quantum degeneracy and develop a quantitative theory to describe this behavior. The theory expresses the post-expansion aspect ratio in terms of temperature and microscopic collisional properties by incorporating Hartree-Fock mean-field interactions, hydrodynamic effects, and Bose-enhancement factors. Our results extend the utility of expansion imaging by providing accurate thermometry for dipolar thermal Bose gases, reducing error in expansion thermometry from tens of percent to only a few percent. Furthermore, we present a simple method to determine scattering lengths in dipolar gases, including near a Feshbach resonance, through observation of thermal gas expansion.

arXiv commentmain text and supplement, 11 pages total, 4 figures

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Cited by in corpus (29)

• Observation of a dipolar quantum gas with metastable supersolid properties
• Transient supersolid properties in an array of dipolar quantum droplets
• Dipolar physics: A review of experiments with magnetic quantum gases
• The low-energy Goldstone mode in a trapped dipolar supersolid
• Thermalization near integrability in a dipolar quantum Newton's cradle
• Dilute dipolar quantum droplets beyond the extended Gross-Pitaevskii equation
• Scissors mode of dipolar quantum droplets of dysprosium atoms
• Observation of vortices and vortex stripes in a dipolar Bose-Einstein condensate
• Creating quantum many-body scars through topological pumping of a 1D dipolar gas
• Tuning the dipole-dipole interaction in a quantum gas with a rotating magnetic field
• Roton Excitations in an Oblate Dipolar Quantum Gas
• Density Fluctuations across the Superfluid-Supersolid Phase Transition in a Dipolar Quantum Gas
• Observation of vortices in a dipolar supersolid
• Dysprosium dipolar Bose-Einstein condensate with broad Feshbach resonances
• Accurate determination of the scattering length of erbium atoms
• Josephson oscillations in split one-dimensional Bose gases
• Anisotropic thermalization of dilute dipolar gases
• Anisotropic collisions of dipolar Bose-Einstein condensates in the universal regime
• Anomalous oscillations of dark solitons in trapped dipolar condensates
• Production and stabilization of a spin mixture of ultracold dipolar Bose gases
• Atomic properties of actinide ions with particle-hole configurations
• Linear Response of a Periodically Driven Thermal Dipolar Gas
• Elliptic flow in a strongly-interacting normal Bose gas
• Thermal Conductivity of an Ultracold Paramagnetic Bose Gas
• Orbital quantum magnetism in spin dynamics of strongly interacting magnetic lanthanide atoms
• Loss features in ultracold ${}^{162}$Dy gases: two- versus three-body processes
• Signatures of rigidity and second sound in dipolar supersolids
• Quasi-two-dimensional soliton in a self-repulsive spin-orbit-coupled dipolar binary condensate
• How many particles do make a fluid? Qualifying collective behavior in expanding ultracold gases