On the growing length scale in a replica-coupled glassforming liquid
arxiv(2024)
摘要
Computer simulations are used to study a three-dimensional polydisperse model
glassformer in a replica-coupling setup where an attractive field ∝ -
ε Q of strength ε can adjust the similarity of the
system to a fixed reference configuration with the overlap parameter Q. The
polydispersity in the model enables the efficient use of swap Monte Carlo in
combination with molecular-dynamics simulation from which we obtain fully
equilibrated liquid configurations at very low temperature, i.e., far below the
critical temperature of mode-coupling theory, T_ MCT. When the
ε-field is switched on, the fast dynamics with swaps allow
relaxation to the stationary state at temperatures below T_ MCT. In the
stationary state, the overlap Q has a finite value that increases with
increasing ε. For a given temperature T, fluctuations of the
overlap around the average value become maximal at a critical field strength
ε^⋆(T). With decreasing T along this
ε^⋆(T)-line, overlap fluctuations increase and a transition
from a unimodal overlap distribution to a bimodal shape occurs. We give
evidence that these bimodal distributions are not due to first-order phase
transitions. However, they reflect finite-size effects due to a rapidly growing
length scale with decreasing temperature. We discuss the significance of this
length scale for the understanding of the glass transition.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要