Using randomly distributed charges to create quantum dots

Abstract

Using a combination of modeling and tunneling spectroscopy, we investigate how electrostatic potential fluctuations generated by randomly distributed ionized donors close to a quantum well can produce deep and strongly confined quantum-dot-like potential minima with a rich spectrum of zero-dimensional electronic energy levels. We consider different types of random distribution of donors and how the electronic properties can be controlled and investigated in appropriately designed double barrier resonant tunneling diodes.