Emergent Fractal Energy Landscape as the Origin of Stress-Accelerated Dynamics in Amorphous Solids
Emergent Fractal Energy Landscape as the Origin of Stress-Accelerated Dynamics in Amorphous Solids
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DOI：
10.1103/physrevlett.127.215502
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发表时间：
2021-11-16
影响因子：
8.6
通讯作者：
Fan, Yue
中科院分区：
文献类型：
--
作者：
Liu, Chaoyi;Fan, Yue
研究了多种亚稳态玻璃在各种热机械条件下的老化动力学。通过使用数据分析来解卷积环境因素（例如能级、温度、应力）的整体影响，并通过直接审查局部激发的最小能量路径，我们证明外部剪切将使系统的能量景观令人惊讶地分形，并创建一种具有高度曲折路径的新兴低势垒模式，从而导致加速松弛。这一发现标志着与剪切引起的简单能源景观偏差的经典图景背离。还讨论了这项研究的见解和意义。
The ageing dynamics in a multiplicity of metastable glasses are investigated at various thermomechanical conditions. By using data analytics to deconvolute the integral effects of environmental factors (e.g., energy level, temperature, stress), and by directly scrutinizing the minimum energy pathways for local excitations, we demonstrate external shear would make the system's energy landscape surprisingly fractal and create an emergent low-barrier mode with highly tortuous pathways, leading to an accelerated relaxation. This finding marks a departure from the classic picture of shear-induced simple bias of energy landscape. The insights and implications of this study are also discussed.