结构化随机性:软盘和销卡死
Structured randomness: Jamming of soft discs and pins
摘要:
模拟是用来找到零温度干扰阈值,$ϕ_j$,软,双分散磁盘的存在下,小的固定颗粒,或“针”,安排在一个格子。正如人们所预期的那样,引脚的存在导致$ϕ_j$减少。干扰阈值附近的系统的结构特性计算作为引脚密度的函数。虽然相关长度指数保持$ν= 1/2$在低引脚密度,该系统是机械稳定的更多的债券,但更少的接触比麦克斯韦标准意味着在没有引脚。此外,随着钉扎密度的增加,出现了新的键取向有序和长程空间有序,这与钉扎晶格的平方对称性有关。
英文摘要:
Simulations are used to find the zero temperature jamming threshold, $ϕ_j$, for soft, bidisperse disks in the presence of small fixed particles, or "pins", arranged in a lattice. The presence of pins leads, as one expects, to a decrease in $ϕ_j$. Structural properties of the system near the jamming threshold are calculated as a function of the pin density. While the correlation length exponent remains $ν= 1/2$ at low pin densities, the system is mechanically stable with more bonds, yet fewer contacts than the Maxwell criterion implies in the absence of pins. In addition, as pin density increases, novel bond orientational order and long-range spatial order appear, which are correlated with the square symmetry of the pin lattice.
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