Resonant Raman scattering of quantum dots

Abstract

We theoretically investigate the resonant Raman scattering of GaAs quantum dots. The electron system is treated within the time-dependent local-density approximation and the cross section is calculated by including valence-band states as intermediate states in the scattering process. We show that, besides the strongly collective charge-density excitations and spin-density excitations, which dominate the spectra in the nonresonant case, additional modes close to the single-particle level spacings become resonant for certain laser energies in polarized and depolarized geometry. However, these modes are also subjected to a small collective shift and occur at slightly different energies in the two polarization geometries.