Mu-Metal Enhancement of Effects in Electromagnetic Fields Over Single Emitters Near Topological Insulators

TL;DR

This paper investigates electromagnetic effects near topological insulators, revealing a heterostructure that significantly enhances field mixing and predicts a measurable deviation in energy flow, advancing understanding of light-matter interactions in TIs.

Contribution

It introduces a simple heterostructure that amplifies electromagnetic mixing coefficients in topological insulators and predicts a detectable transverse deviation of the Poynting vector.

Findings

100-fold enhancement of mixing coefficients in TI heterostructures

Transverse deviation of Poynting vector up to 0.18%

Effect increases with TI's wave impedance

Abstract

We focus on the transmission and reflection coefficients of light in systems involving of topological insulators (TI). Due to the electro-magnetic coupling in TIs, new mixing coefficients emerge leading to new components of the electromagnetic fields of propagating waves. We have discovered a simple heterostructure that provides a 100-fold enhancement of the mixing coefficients for TI materials. Such effect increases with the TI's wave impedance. We also predict a transverse deviation of the Poynting vector due to these mixed coefficients contributing to the radiative electromagnetic field of an electric dipole. Given an optimal configuration of the dipole-TI system, this deviation could amount to $0.18\%$ of the Poynting vector due to emission near not topological materials, making this effect detectable.