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.

main text and supplement, 11 pages total, 4 figures

References in corpus (8)

• Bose-Einstein Condensation of Erbium
• Stabilizing a purely dipolar quantum gas against collapse
• Comparing contact and dipolar interaction in a Bose-Einstein condensate
• Observation of Fermi surface deformation in a dipolar quantum gas
• Classical and quantum regimes of two-dimensional turbulence in trapped Bose-Einstein condensates
• Bose-Einstein condensation of 162Dy and 160Dy
• Fermionic suppression of dipolar relaxation: Observation of universal inelastic dipolar scattering
• Nonequilibrium dynamics of an ultracold dipolar gas

Cited by in corpus (16)

• Transient supersolid properties in an array of dipolar quantum droplets
• Dipolar physics: A review of experiments with magnetic quantum gases
• Observation of vortices and vortex stripes in a dipolar Bose-Einstein condensate
• Roton Excitations in an Oblate Dipolar Quantum Gas
• Observation of vortices in a dipolar supersolid
• Accurate determination of the scattering length of erbium atoms
• Anisotropic thermalization of dilute dipolar gases
• Anisotropic collisions of dipolar Bose-Einstein condensates in the universal regime
• 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
• Thermal Conductivity of an Ultracold Paramagnetic Bose Gas
• Loss features in ultracold ${}^{162}$Dy gases: two- versus three-body processes
• Signatures of rigidity and second sound in dipolar supersolids
• How many particles do make a fluid? Qualifying collective behavior in expanding ultracold gases
• Quasi-two-dimensional soliton in a self-repulsive spin-orbit-coupled dipolar binary condensate