Spectral description of fluctuating electromagnetic fields of solids including a self consistency

TL;DR

This paper introduces a self-consistent method to evaluate the spectral-correlation properties of thermal electromagnetic fields of solids, incorporating detailed interface structures and using density functional theory for improved accuracy.

Contribution

It presents a novel approach combining response functions with density functional theory to accurately compute spectral properties of fluctuating electromagnetic fields in solids.

Findings

Method accounts for detailed interface structures.

Enables self-consistent calculation of response functions.

Provides spectral power densities of thermal fields.

Abstract

Another way to evaluate the spectral-correlation properties of thermal fields of solids is suggested. Such a method takes into account detailed structure of the interface transition layer separating one bulk region from those of the vacuum region. The principal element here is the surface linear response function of an arbitrary inhomogeneous electron subsystem of solids. Along with straightforward using the known response functions, for example in a hydrodynamic approach, the suggested method allows calculating the response functions self-consistently based on the time dependent density functional theory. The self-consistent calculation of the linear response function followed by an application of the fluctuation-dissipation theorem yield in the spectral power densities of the fluctuating charge and current correlation functions. The final step of this sequence of actions aiming in obtaining the spectral-correlation properties of thermal fields of solids at any distances.