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Two typical structure patterns in jammed monodisperse disk packings at high densities

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  • Yuan, Ye
  • Jin, Weiwei
  • Liu, Lufeng
  • Li, Shuixiang

Abstract

We generate a large number of monodisperse disk packings in two dimensions via geometric-based packing algorithms including the relaxation algorithm and the Torquato–Jiao algorithm. Using the geometric-structure approach, a clear boundary of the geometrical feasible region in the order map is found which quite differs from that of the jammed region. For a certain packing density higher than 0.83, the crystalline degree varies in different packing samples. We find that the local hexatic order may increase in two fairly different ways as the system densifies. Therefore, two typical non-equilibrium jammed patterns, termed polycrystal and distorted crystal, are defined at high packing densities. Furthermore, their responses to isotropic compression are investigated using a compression–relaxation molecular dynamic protocol. The distorted crystal pattern is more stable than the polycrystal one with smaller displacements despite its low occurrence frequency. The results are helpful in understanding the structure and phase transition of disk packings.

Suggested Citation

  • Yuan, Ye & Jin, Weiwei & Liu, Lufeng & Li, Shuixiang, 2016. "Two typical structure patterns in jammed monodisperse disk packings at high densities," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 461(C), pages 747-755.
    • Handle: RePEc:eee:phsmap:v:461:y:2016:i:c:p:747-755
    DOI: 10.1016/j.physa.2016.06.037
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    References listed on IDEAS

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    1. A. Cacciuto & S. Auer & D. Frenkel, 2004. "Onset of heterogeneous crystal nucleation in colloidal suspensions," Nature, Nature, vol. 428(6981), pages 404-406, March.
    2. Liu, Lufeng & Lu, Peng & Meng, Lingyi & Jin, Weiwei & Li, Shuixiang, 2016. "Order metrics and order maps of octahedron packings," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 444(C), pages 870-882.
    3. Brujić, Jasna & F. Edwards, Sam & Hopkinson, Ian & Makse, Hernán A., 2003. "Measuring the distribution of interdroplet forces in a compressed emulsion system," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 327(3), pages 201-212.
    4. T. Dotera & T. Oshiro & P. Ziherl, 2014. "Mosaic two-lengthscale quasicrystals," Nature, Nature, vol. 506(7487), pages 208-211, February.
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