SPACE-CHARGE FIELD IN PHOTOREFRACTIVE MEDIA WITH A CONSTANT APPLIED MAGNETIC-FIELD

The photorefractive band transport model is extended to include magnetic effects. The Newtonian equation of motion for electrons in the conduction band under combined electric and magnetic forces is derived from basic statistical principles. A solution for the space-charge electric field in the steady-state regime is obtained. Only the magnetic field, applied perpendicularly to the grating wave vector, is shown to influence the phase and magnitude of the space-charge electric field, and only for cases in which the external applied electric field and the grating wave vector are nonparallel. The effect of the magnetic field is crucially dependent on the free-carrier mobility. Enhancement of the modulus of the space-charge field by a factor of 2 has been obtained for a specific geometry.