论文标题
本地事件动力学的缓慢拉伸指数和快速压缩的指数放松
Slow stretched-exponential and fast compressed-exponential relaxation from local event dynamics
论文作者
论文摘要
我们提出了一个用于液体和玻璃杯中相关颗粒动力学的原子模型，以预测慢速拉伸指数弛豫（SER）和快速压缩 - 指数弛豫（CER）。该模型基于弹性相互作用的局部放松事件的关键概念。 SER与由于这种相互作用而减慢局部松弛事件的动态有关，而CER与低温玻璃状态中的雪崩样动力学有关。该模型可以预测SER和CER的温度依赖性，并在高温下恢复了简单的，DEBYE的指数衰减。最后，我们在最近在金属眼镜中观察到的玻璃过渡中将SER重现为CER跨界。
We propose an atomistic model for correlated particle dynamics in liquids and glasses predicting both slow stretched-exponential relaxation (SER) and fast compressed-exponential relaxation (CER). The model is based on the key concept of elastically interacting local relaxation events. SER is related to slowing down of dynamics of local relaxation events as a result of this interaction, whereas CER is related to the avalanche-like dynamics in the low-temperature glass state. The model predicts temperature dependence of SER and CER seen experimentally and recovers the simple, Debye, exponential decay at high temperature. Finally, we reproduce SER to CER crossover across the glass transition recently observed in metallic glasses.
