A crossover in spatio-temporal correlations of strain fluctuations in glass forming liquids
A crossover in spatio-temporal correlations of strain fluctuations in glass forming liquids
复制标题
玻璃形成液体中应变波动的时空相关性的交叉
DOI：
10.1088/1742-5468/ab5366
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
F. Varnik
中科院分区：
文献类型：
--
作者：
M. Hassani;M. Bruns;F. Varnik
通过分子动力学模拟的一个通用的玻璃前在过冷和正常的液体状态，它表明，应变波动的空间相关性表现出一个交叉，从公认的幂律r1/r3-衰减在长波长的指数行为，在中间距离的交叉。指数衰减的特征长度随着温度和时间的增加而增加，其中，是与温度相关的扩散系数。这表明，幂律和指数衰减之间的交叉是由扩散过程。
Via molecular dynamics simulations of a generic glass former in the supercooled and normal liquid states, it is shown that spatial correlations of strain fluctuations exhibit a crossover from the well-established power-law ∼1/r3-decay at long wavelengths to an exponential behavior, ∼ at intermediate distances. The characteristic length of the exponential decay grows both with temperature and time via, , with being the temperature-dependent diffusion coefficient. This suggests that the crossover between the power-law and exponential decays is governed by a diffusion process.