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arXiv · 1601.07746

Pseudopotentials for an ultracold dipolar gas

T. M. Whitehead·G. J. Conduit
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Abstract

A gas of ultracold molecules interacting via the long-range dipolar potential offers a highly controlled environment in which to study strongly correlated phases. However, at particle coalescence the divergent $1/r^3$ dipolar potential and associated pathological wavefunction hinder computational analysis. For a dipolar gas constrained to two dimensions we overcome these numerical difficulties by proposing a pseudopotential that is explicitly smooth at particle coalescence, resulting in a 2000-times speedup in diffusion Monte Carlo calculations. The pseudopotential delivers the scattering phase shifts of the dipolar interaction with an accuracy of $10^{-5}$ and predicts the energy of a dipolar gas to an accuracy of $10^{-4}E_\mathrm{F}$ in a diffusion Monte Carlo calculation.

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T. M. Whitehead, G. J. Conduit. 2016-01-28. Pseudopotentials for an ultracold dipolar gas. https://doi.org/10.1103/physreva.93.022706

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