Correlation functions and queuing phenomena in growth processes with drift

Abstract

We suggest a novel stochastic discrete growth model which describes the drifted Edward-Wilkinson (EW) equation $\partial h /\partial t = ν\partial_x^2 h - v\partial_x h +η(x,t)$. From the stochastic model, the anomalous behavior of the drifted EW equation with a defect is analyzed. To physically understand the anomalous behavior the height-height correlation functions $C(r)=< |h({x_0}+r)-h(x_0)|>$ and $G(r)=< |h({x_0}+r)-h(x_0)|^2>$ are also investigated, where the defect is located at $x_0$. The height-height correlation functions follow the power law $C(r)\sim r^{α&#39;}$ and $G(r)\sim r^{α&#39;&#39;}$ with $α&#39;=α&#39;&#39;=1/4$ around a perfect defect at which no growth process is allowed. $α&#39;=α&#39;&#39;=1/4$ is the same as the anomalous roughness exponent $α=1/4$. For the weak defect at which the growth process is partially allowed, the normal EW behavior is recovered. We also suggest a new type queuing process based on the asymmetry $C(r) \neq C(-r)$ of the correlation function around the perfect defect.