Correlation functions and queuing phenomena in growth processes with drift

We suggest a novel stochastic discrete growth model which describes the drifted Edward-Wilkinson (EW) equation $\partial h /\partial t = \nu \partial_x^2 h - v\partial_x h +\eta(x,t)$. 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 $C(r)=<\mathrm{\mid }h(x_0+r)-h(x_0)\mathrm{\mid }>$ and $G(r)=<\mathrm{\mid }h(x_0+r)-h(x_0){\mathrm{\mid }}^2>$ are also investigated, where the defect is located at $x_0$. The height-height correlation functions follow the power law $C(r)\sim r^{{\alpha }^{\mathrm{\prime }}}$ and $G®\sim r^{\alpha’‘}$with$\alpha’=\alpha’'=1/4$ around a perfect defect at which no growth process is allowed. ${\alpha }^{\mathrm{\prime }}={\alpha }^{\mathrm{\prime }\mathrm{\prime }}=1\mathrm{/}4$ is the same as the anomalous roughness exponent $\alpha =1\mathrm{/}4$. 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 $C(r)\mathrm{\ne }C(-r)$ of the correlation function around the perfect defect.