Photo-Hall, photorefractive and photomagnetoelectric effects in tungsten bronzes and related tetragonal ferroelectrics

TL;DR

This paper develops a comprehensive theoretical framework to analyze the electric, magnetic, and elastic responses of tetragonal ferroelectrics under illumination, revealing new effects like the photo-Hall effect in tungsten bronzes.

Contribution

It introduces a new theory linking material and wave symmetries to describe various photo-induced responses in tetragonal ferroelectrics, including novel effects.

Findings

Detailed description of optical rectification, photomagnetic, photovoltaic, and phototoroidal responses.

Identification of a new non-linear optical effect in tungsten bronzes.

Comparison of tetragonal ferroelectrics with other crystal symmetries.

Abstract

We present an extensive study of the electric, magnetic and elastic responses of tetragonal ferroelectrics under illumination, using a new theory intertwining material and wave symmetries. Optical rectification, photomagnetic, photovoltaic and phototoroidal vector responses are worked out as functions of the wave vector and wave polarization directions. Second-order response tensors associated with photoelastic, photomagnetoelectric, photorefractive effects and photoconductivity are described. We discuss in detail the photo-Hall and a new non-linear optical effect in tungsten bronzes. Finally, we compare the properties of tetragonal materials with those of hexagonal, orthorhombic and trigonal ferroelectrics previously reported in the literature.