Lifetime of dynamical heterogeneity in a highly supercooled liquid

摘要: We numerically examine dynamical heterogeneity in a highly supercooled three-dimensional liquid via molecular-dynamics simulations. To define the local dynamics, we consider two time intervals: τ(α) and τ(ngp). is α relaxation time, τ(ngp) at which non-gaussian parameter of Van Hove self-correlation function maximized. determine lifetimes heterogeneous dynamics these different intervals, τ(hetero)(τ(α)) τ(hetero)(τ(ngp)), by calculating correlation particle i.e., four-point function. find that difference between τ(hetero)(τ(ngp)) increases with decreasing temperature. At low temperatures, considerably larger than τ(α), while remains comparable to τ(α). Thus, lifetime depends strongly on interval.