On the Photorefractive Gunn Effect

We present and numerically solve a model of the photorefractive Gunn effect. We find that high field domains can be triggered by phase-locked interference fringes, as it has been recently predicted on the basis of linear stability considerations. Since the Gunn effect is intrinsically nonlinear, we find that such considerations give at best order-of-magnitude estimations of the parameters critical to the photorefractive Gunn effect. The response of the system is much more complex including multiple wave shedding from the injecting contact, wave suppression and chaos with spatial structure.Comment: Revtex, 8 pag., 4 fig. (jpg), submit to Physical Review

Theory and simulation of the nematic zenithal anchoring coefficient

Combining molecular simulation, Onsager theory and the elastic description of nematic liquid crystals, we study the dependence of the nematic liquid crystal elastic constants and the zenithal surface anchoring coefficient on the value of the bulk order parameter

Experimental studies of light-microwave field interaction and nonequilibrium carrier transport in GaAs

Contactless nonlinear optics and microwave techniques are combined to study nonequilibrium carrier transport and photoelectric properties of GaAs crystals in electric fields. Peculiarities of complex diffusion-drift processes of photoexcited carrier plasma under microwave heating.and fast transients of carrier transport in space-charge internal electric field are analysed by measuring orientational, temporal and field dependences of light diffraction on light-induced transient grating

Laser-induced gratings and hot-carrier dynamics in III-V semiconductors

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