Abstract
Charged domain walls (CDWs), which possess metallic-type conductivity and can be created and controlled in the bulk of wide-band-gap ferroelectrics, attract nowadays a strong research interest. The most advanced method for production of stable CDWs involves weak super-band-gap illumination. Here, we investigate theoretically the impact of this illumination on the major wall properties including the energy and the spatial profiles of the polarization, of the electrostatic potential, and of the compensating charge carriers. The key material parameters determining the effect of light are the zero-field polarization strength, the dielectric permittivity, and the trap concentration. The main predictions are substantial reduction of the wall energies and decrease of the electric wall potential under light. These features facilitate creation of dense CDWs patterns and accessibility of the metallic-type wall conductivity.
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