Exact-Diagonalization Studies of Inelastic Light Scattering in Self-Assembled Quantum Dots

TL;DR

This study uses exact diagonalization to analyze inelastic light scattering in self-assembled quantum dots, revealing dominant monopole peaks and the influence of electron number and photon energy on spectra.

Contribution

It provides a detailed theoretical analysis of inelastic light scattering in quantum dots using exact diagonalization, highlighting effects not previously fully understood.

Findings

Monopole peaks dominate Raman spectra.

Selection rules break down in open-shell dots.

Spectral features depend on electron number and photon energy.

Abstract

We report exact diagonalization studies of inelastic light scattering in few-electron quantum dots under the strong confinement regime characteristic of self-assembled dots. We apply the orthodox (second-order) theory for scattering due to electronic excitations, leaving for the future the consideration of higher-order effects in the formalism (phonons, for example), which seem relevant in the theoretical description of available experiments. Our numerical results stress the dominance of monopole peaks in Raman spectra and the breakdown of selection rules in open-shell dots. The dependence of these spectra on the number of electrons in the dot and the incident photon energy is explicitly shown. Qualitative comparisons are made with recent experimental results.