Electronic Raman scattering in quantum dots revisited

TL;DR

This paper provides a theoretical analysis of inelastic light scattering in semiconductor quantum dots, aiming to improve the understanding and identification of various excited states through Raman spectroscopy.

Contribution

It introduces a method to determine quantum dot state characteristics independently of the Raman spectrum, enabling testing of common spectral assignment beliefs.

Findings

Below band gap excitation helps identify charge and spin states

External magnetic fields assist in distinguishing collective and single-particle excitations

The approach challenges traditional level assignment methods in experimental spectra

Abstract

We present theoretical results concerning inelastic light (Raman) scattering from semiconductor quantum dots. The characteristics of each dot state (whether it is a collective or single-particle excitation, its multipolarity, and its spin) are determined independently of the Raman spectrum, in such a way that common beliefs used for level assignments in experimental spectra can be tested. We explore the usefulness of below band gap excitation and an external magnetic field to identify charge and spin excited states of a collective or single-particle nature.