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arXiv · 2409.19196

Generating ultradense jammed ellipse packings using biased SWAP

Robert S. Hoy
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Abstract

Using a Lubachevsky-Stillinger-like growth algorithm combined with biased SWAP Monte Carlo and transient degrees of freedom, we generate ultradense disordered jammed ellipse packings. For all aspect ratios $\alpha$, these packings exhibit significantly smaller intermediate-wavelength density fluctuations and greater local nematic order than their less-dense counterparts. The densest packings are disordered despite having packing fractions $\phi_{\rm J}(\alpha)$ that are within less than 0.5% of that of the monodisperse-ellipse crystal [$\phi_{\rm xtal} = \pi/(2\sqrt{3}) \simeq .9069$] over the range $1.25 \lesssim \alpha \lesssim 1.4$ and coordination numbers $Z_{\rm J}(\alpha)$ that are within less than 0.5% of isostaticity [$Z_{\rm iso} = 6$] over the range $1.3 \lesssim \alpha \lesssim 2.0$. Lower-$\alpha$ packings are strongly fractionated and consist of polycrystals of intermediate-size particles, with the largest and smallest particles isolated at the grain boundaries. Higher-$\alpha$ packings are also fractionated, but in a qualitatively-different fashion; they are composed of increasingly-large locally-nematic domains reminiscent of liquid glasses.

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Robert S. Hoy. 2024-09-28. Generating ultradense jammed ellipse packings using biased SWAP. https://arxiv.org/abs/2409.19196

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