Geometrical properties of mechanically annealed systems near the jamming transition
Geometrical properties of mechanically annealed systems near the jamming transition
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DOI：
10.1140/epje/s10189-021-00142-6
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发表时间：
2021-08
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影响因子：
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通讯作者：
Hiromichi Matsuyama;Mariko Toyoda;Takumi Kurahashi;A. Ikeda;T. Kawasaki;K. Miyazaki
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作者：
Hiromichi Matsuyama;Mariko Toyoda;Takumi Kurahashi;A. Ikeda;T. Kawasaki;K. Miyazaki
利用机械训练下的简谐粒子，数值研究了干扰转捩点附近二维混合物的几何性质。由准静态压缩和振荡剪切变形产生的配置表现出异常抑制的密度波动，称为超均匀性，下面和上面的干扰过渡。对于经过压缩训练的干扰系统，在过渡点以上，超均匀性指数增加。在振荡剪切作用下，对于低于相变点的体系，超均匀性指数也会增加，直到剪切振幅达到阈值。阈值与从点可逆阶段到环可逆阶段的转变点相匹配，在点可逆阶段中，粒子不经历碰撞，在环可逆阶段中，粒子的位移在返回到原始位置之前在剪切循环期间是非仿射的。本文的结果既不能用阻塞相变的普适临界性来解释，也不能用非平衡相变来解释。
Geometrical properties of two-dimensional mixtures near the jamming transition point are numerically investigated using harmonic particles under mechanical training. The configurations generated by the quasi-static compression and oscillatory shear deformations exhibit anomalous suppression of the density fluctuations, known as hyperuniformity, below and above the jamming transition. For the jammed system trained by compression above the transition point, the hyperuniformity exponent increases. For the system below the transition point under oscillatory shear, the hyperuniformity exponent also increases until the shear amplitude reaches the threshold value. The threshold value matches with the transition point from the point-reversible phase where the particles experience no collision to the loop-reversible phase where the particles’ displacements are non-affine during a shear cycle before coming back to an original position. The results demonstrated in this paper are explained in terms of neither of universal criticality of the jamming transition nor the nonequilibrium phase transitions.