Probability distributions for kinetic roughening in the Kardar–Parisi–Zhang growth with long-range spatiotemporal correlations

Abstract We investigate numerically the effects of long-range temporal and spatial correlations based on the rescaled distributions of the squared interface width W 2 ( L , t ) and the interface height h ( x , t ) in the (1+1)-dimensional Kardar–Parisi–Zhang (KPZ) growth system within the early growth regime. Through extensive numerical simulations, we find that long-range temporally correlated noise does not significantly impact the distribution form of the interface width. Generally, W 2 ( L , t ) approximately obeys a lognormal distribution when the temporal correlation exponent θ ≥ 0. On the other hand, the effects of long-range spatially correlated noise are evidently different from the temporally correlated case. Our results show that, when the spatial correlation exponent ρ ≤ 0.20, the distribution forms of W 2 ( L , t ) approach the lognormal distribution, and when ρ > 0.20, the distribution becomes more asymmetric, steep, and fat-tailed, and tends to an unknown distribution form. As a comparison, probability distributions of the interface height are also provided in the temporally and spatially correlated KPZ system, exhibiting quite different characteristics from each other within the whole correlated strengths. For the temporal correlation, the height distributions follow Tracy–Widom Gaussian orthogonal ensemble (TW-GOE) when θ → 0, and with increasing θ , the height distributions crossover continuously to an unknown distribution. However, for the spatial correlation, the height distributions gradually transition from the TW-GOE distribution to the standard Gaussian form.