Abstract
Steady-state bright (or dark) spatial solitons are predicted for biased two-photon photovoltaic-photorefractive materials due to two-photon photorefractive effects. These solitons differ from those solitons recently predicted by Hou et al. [Physical Review A71, 053817 (2005)] in their properties and experimental conditions. These solitons are known as two-photon screening-photovoltaic solitons. We present the one-dimensional dynamical evolution equation and find the soliton solutions under appropriate conditions in a steady state. By use of perturbation techniques, we also investigate the self-deflection process of these bright solitons with taking diffusion effect into account.
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