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

Abstract

We present, at the phenomenological point of view, the responses of tetragonal ferroelectrics under linearly polarized light illumination, using a new theory based on the intertwining of the symmetries of both the material and the incident wave. Photopolarization, 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, photoconductivity, and photo-Hall effects are also described in detail. We focus attention on the tetragonal and orthorhombic phases in crystals of the family of tungsten bronzes, and we discuss related tetragonal materials.

Keywords:

• Tetragonal tungsten bronze
• crystal symmetry
• Wigner function
• tensorial response

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