Macroscopic fluctuation theory and first-passage properties of surface diffusion

TL;DR

This paper develops a macroscopic fluctuation theory for surface diffusion governed by the stochastic Mullins-Herring equation, analyzing the probability and optimal path for the interface to reach a large height at a specific time.

Contribution

It introduces a novel macroscopic fluctuation framework to study first-passage properties of surface diffusion, extending beyond previous scaling analyses.

Findings

Derived the probability distribution for the interface reaching a large height.

Identified the optimal interface history conditioned on the first-passage event.

Provided analytical results for non-equilibrium fluctuation behavior of surface diffusion.

Abstract

We investigate non-equilibrium fluctuations of a solid surface governed by the stochastic Mullins-Herring equation with conserved noise. This equation describes surface diffusion of adatoms accompanied by their exchange between the surface and the bulk of the solid, when desorption of adatoms is negligible. Previous works dealt with dynamic scaling behavior of the fluctuating interface. Here we determine the probability that the interface first reaches a large given height at a specified time. We also find the optimal time history of the interface conditional on this non-equilibrium fluctuation. We obtain these results by developing a macroscopic fluctuation theory of surface diffusion.