Optical and resonant tunnelling spectroscopy of self-assembled quantum dotsystems

The electronic properties of self-assembled quantum dots have been studied by means of optical and tunnelling spectroscopy. The effect of confining ba rrier composition and design on the thermal behaviour of the dot optical pr operties is reported and exploited for the realisation of quantum dot based lasers. Tunnel current spectroscopy through a single discrete quantum dot state is used to investigate the electronic properties of an adjacent two-d imensional electron gas, including the Landau level density of stales and m any-body enhanced g-factor in the presence of a magnetic field.