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arXiv · 1606.08856

Anisotropic expansion of a thermal dipolar Bose gas

Yijun Tang·Andrew G. Sykes·Nathaniel Q. Burdick·Jack M. DiSciacca·Dmitry S. Petrov·Benjamin L. Lev
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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.

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Yijun Tang, Andrew G. Sykes, Nathaniel Q. Burdick, Jack M. DiSciacca, Dmitry S. Petrov, Benjamin L. Lev. 2016-06-28. Anisotropic expansion of a thermal dipolar Bose gas. https://doi.org/10.1103/physrevlett.117.155301

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