Interface collisions with diffusive mass transport

TL;DR

This paper introduces a linear Langevin model to describe the roughness evolution of two diffusing interfaces approaching each other, capturing different growth regimes and reproducing features seen in simulations.

Contribution

The study presents a novel Langevin-based framework for modeling interface collision and roughness dynamics during material growth.

Findings

Identifies three growth regimes: slow without peak, fluctuation-dominated peak, and instability-driven peak.

Reproduces main features observed in kinetic Monte Carlo simulations.

Provides a phase diagram characterizing different roughness behaviors.

Abstract

We report on a linear Langevin model that describes the evolution of the roughness of two interfaces that move towards each other and are coupled by a diffusion field. This model aims at describing the closing of the gap between two two-dimensional material domains during growth, and the subsequent formation of a rough grain boundary. We assume that deposition occurs in the gap between the two domains and that the growth units diffuse and may attach to the edges of the domains. These units can also detach from edges, diffuse, and re-attach elsewhere. For slow growth, the edge roughness increases monotonously and then saturates at some equilibrium value. For fast growth, the roughness exhibits a maximum just before the collision between the two interfaces, which is followed by a minimum. The peak of the roughness can be dominated by statistical fluctuations or by edge instabilities. A phase diagram with three regimes is obtained: slow growth without peak, peak dominated by statistical fluctuations, and peak dominated by instabilities. These results reproduce the main features observed in Kinetic Monte Carlo simulations.