  Sequential single-electron charging is observed in InAs Self-Assembled
Quantum Dots using capacitance spectroscopy. In this system, the Coulomb energy
is smaller than the inter-level energy spacings due to the quantum confinement
and both effects can be separately identified. A theoretical model is proposed
for this system and the capacitance experiments were devised in order to
experimentally observe the effects of Coulomb interaction between electrons on
the dots. The effects of inter- and intra-dot Coulomb interaction have been
observed in the capacitanc e spectra. A good agreement between the proposed
model and experiment is achieved.
