Terahertz space-charge interactions in a semiconductor nanoplate

To properly account for space-charge effects, transport models can be employed in the analysis of charge motions within semiconductor nanostructures. In this paper, we present the analysis and computations of internal charge and field distributions in a semiconductor nanoplate. Analytical and numerical simulation results reveal space-charge waves excited in the plate as the bulk plasma frequency is approached, which is in the terahertz band. A lumped equivalent circuit is developed to characterize the dispersion properties and to facilitate the consideration of more complex structures based on aggregates of nanoplates for potential circuit and waveguide applications in the terahertz frequency range.