Progress on Nonlinearities in Semiconductor Superlattices

Abstract: This talk starts with a review of analytical approximations for the nonlinear GHz-THz response of semiconductor superlattices, which are compared and contrasted with a rigorous numerical solution. Next we show experimental verifications of the theory for both voltage and input power control of the nonlinear response as well as the rectification of current-voltage current curves due to input power. To the best of our knowledge these are first verifications in this range and show very good agreement with the theoretical predictions. In the final part of the talk we demonstrate numerically the control of nonlinearties per interface design and the predicted output for superlattices acting as multipliers for the available range of input devices.