Polarization sensitive photo recharging and optical alignment of the tetragonal Fe3+ centers in KTaO3

Abstract

Orientation sensitive recharging of tetragonal Fe-K-O-i centers in KTaO3 under polarized optical irradiation was observed resulting in the `'alignment'' of the centers in particular charge state. The sign of the alignment altered in the course of irradiation. A phenomenological model involving photo charge transport allowed for a semiquantitative description of the experiments.