Dynamical Renormalization Group Study of a Conserved Surface Growth with Anti-Diffusive and Nonlinear Currents

Abstract

Based on dynamical renormalization group (RG) calculations to the one-loop order, the surface growth described by a nonlinear stochastic conserved growth equation, {\partial h \over \partial t} = \pm ν_2 \nabla^2 h + λ\nabla \cdot (\nabla h)^3 + η, is studied analytically. The universality class of the growth described by the above equation with +{ν_2} (diffusion) is shown to be the same as that described by the Edwards-Wilkinson (EW) equation (i.e. +ν_2 and λ=0). In contrast our RG recursion relations manifest that the growth described by the above equation with {-ν_2}(anti-diffusion) is an unstable growth and do not reproduce the recent results from a numerical simulation by J. M. Kim [Phys. Rev. E 52, 6267 (1995)].