Electronic Raman Spectroscopy of Quantum Dots

We review selected experimental and theoretical results on Raman spectroscopy of electronic excitations in charged quantum dots. Mainly, two different quantum dot systems have been investigated: GaAs–AlGaAs QDs fabricated by a lithographic top-down approach and InGaAs QDs grown by molecular beam epitaxy in a self-assembling bottom-up process. We recapitulate and compare the results of Raman experiments on both systems. We address collective many-particle charge and spin excitations, their magnetic field dispersion and dependence on a wave vector transfer, as well as their particular selection rules. We also review very recent experiments on self-assembled QDs containing exactly two electrons, since they form the simplest systems to study the most fundamental many-particle effects.