Spectral Density Scaling of Fluctuating Interfaces

TL;DR

This paper investigates the spectral density of covariance matrices derived from fluctuating self-affine surfaces, revealing deviations from random matrix theory predictions and identifying specific scaling behaviors for different surface growth classes.

Contribution

It introduces a scaling form for spectral density of covariance matrices in self-affine surfaces and distinguishes the spectral properties of Edwards-Wilkinson and Kardar-Parisi-Zhang classes.

Findings

Spectral density scales as $ ho(\lambda) \\sim \\lambda^{- u}$ with class-dependent exponents.

Largest eigenvalue distribution deviates from Tracy-Widom distribution.

Scaling exponents for spectral density and eigenvalues are numerically determined for both classes.

Abstract

Covariance matrix of heights measured relative to the average height of a growing self-affine surface in the steady state are investigated in the framework of random matrix theory. We show that the spectral density of the covariance matrix scales as $\rho(\lambda) \sim \lambda^{-\nu}$ deviating from the prediction of random matrix theory and has a scaling form, $\rho(\lambda, L) = \lambda^{-\nu} f(\lambda / L^{\phi})$ for the lateral system size $L$, where the scaling function $f(x)$ approaches a constant for $x \ll 1$ and zero for $x \gg 1$. The obtained values of exponents by numerical simulations are $\nu \approx 1.73$ and $\phi \approx 1.40$ for the Edward-Wilkinson class and $\nu \approx 1.64$ and $\phi \approx 1.79$ for the Kardar-Parisi-Zhang class, respectively. The distribution of the largest eigenvalues follows a scaling form as $\rho(\lambda_{max}, L) = 1/L^b f_{max} ((\lambda_{max} -L^a)/L^b)$, which is different from the Tracy-Widom distribution of random matrix theory while the exponents $a$ and $b$ are given by the same values for the two different classes.