Anisotropic thermalization of dilute dipolar gases

Abstract

We study collisional rethermalization in ultracold dipolar thermal gases, made intricate by their anisotropic differential cross sections. Theoretical methods are provided to derive the number of collisions per rethermalization, which for dipolar gases, is highly dependent on the dipole alignment axis. These methods are formulated to be easily applied in experimental contexts, even reducing to analytic expressions if the route to thermal equilibrium is governed by short-time dynamics. In the analytic case, collisional rethermalization is fully characterized by the dipole magnitude and orientation, scattering length, and thermalization geometry. These models compare favorably to Monte Carlo simulations, and are shown to model well a recent experimental result on the rethermalization of polar molecular samples.

arXiv comment11 pages, 9 figures

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Cited by in corpus (13)

• Evaporation of microwave-shielded polar molecules to quantum degeneracy
• Tuning of dipolar interactions and evaporative cooling in a three-dimensional molecular quantum gas
• Collisionally Stable Gas of Bosonic Dipolar Ground State Molecules
• Microwave shielding of bosonic NaRb molecules
• Field-linked resonances of polar molecules
• Accurate determination of the scattering length of erbium atoms
• Double Microwave Shielding
• Thermoviscous Hydrodynamics in Non-Degenerate Dipolar Bose Gases
• Thermal Conductivity of an Ultracold Paramagnetic Bose Gas
• Anisotropic acoustics in dipolar Fermi gases
• Collective excitations of a Bose-condensed gas: Fate of second sound in the crossover regime between hydrodynamic and collisionless regimes
• Model for two-body collisions between ultracold dipolar molecules around a Förster resonance in an electric field
• Strongly dipolar molecular Bose-Einstein condensates: From few- to many-body physics