Polaron induced parametric interactions in magnetized semiconductors
R Agrawal, Swati Dubey, Shreya Ghosh · Journal of Physics Conference Series · 2012
In the framework of hydrodynamic model of semiconductor plasma, the parametric amplification due to polaron mode has been analytically investigated in a magnetized III–V semiconductor, viz. n-InSb. The origin of the phenomenon lies in the effective second-order optical susceptibility arising due to the induced nonlinear current density of the medium. Using the coupled-mode theory, the expressions for the parametric gain coefficient and the threshold amplitudes of the external electric field above which the parametric instability can occur are derived. The effect of the wave vector and the strength of the external magnetic field on the gain coefficient and the threshold amplitude of the pump electric field are analyzed. Reported results strongly suggest that at appropriate pump electric field, proper selection of the magnetic field not only lowers threshold pump field required for the onset of parametric excitation but also enhances gain effectively.