Nonlinear high-frequency hopping conduction in two-dimensional arrays of Ge-in-Si quantum dots: Acoustic methods

摘要

Using acoustic methods we have measured nonlinear AC conductance in 2D arraysof Ge-in-Si quantum dots. The combination of experimental results and modelingof AC conductance of a dense lattice of localized states leads us to theconclusion that the main mechanism of AC conduction in hopping systems withlarge localization length is due to the charge transfer within large clusters,while the main mechanism behind its non-Ohmic behavior is charge heating byabsorbed power.