High-temperature effects on oscillatory conductivity in disordered quantum dot arrays: Role of Coulomb interactions and localization length

Abstract

Using a theoretical model that incorporates the full energy landscape of the electronic density of states of disordered arrays of quantum dots (DAQDs) with a realistic size distribution and non-uniform doping, we have examined the oscillatory behavior of electrical conductivity σ as a function of the average doping concentration ND. We find that Coulomb interactions between charged quantum dots suppress the magnitude of these oscillations, whereas increasing the temperature increases the magnitude of these oscillations. Furthermore, the magnitude of the oscillations increases with an increase of the localization length ξ. The observed oscillatory behavior of σ suggests the potential for optimizing the conductivity of DAQDs for application-specific purposes through controlled doping.