Noise from metallic surfaces -- effects of charge diffusion

TL;DR

This paper develops non-local electrodynamic models to explain electric field noise from metallic surfaces, showing that surface diffusion can account for observed anomalous heating effects in ion chip experiments.

Contribution

It introduces a non-local model incorporating charge diffusion to explain electric field noise near metallic surfaces, aligning theory with experimental observations.

Findings

High surface diffusion explains z_0^{-4} noise decay.

Model matches ion chip anomalous heating data.

Charge diffusion significantly impacts surface noise.

Abstract

Non-local electrodynamic models are developed for describing metallic surfaces for a diffusive metal. The electric field noise at a distance z_0 from the surface is evaluated and compared with data from ion chips that show anomalous heating with a noise power decaying as z_0^{-4}. We find that high surface diffusion can account for the latter result.