Internal transitions of negatively charged magnetoexcitons in quantum dots

TL;DR

This paper calculates the far infrared absorption spectra of negatively charged magnetoexcitons in quantum dots, revealing electron-hole interaction effects and transition characteristics across varying magnetic fields.

Contribution

It provides detailed calculations of oscillator strengths for Xn- complexes in quantum dots, highlighting interaction effects and transition densities in magnetic fields.

Findings

Deviations of peak positions from Kohn lines due to electron-hole interactions

Oscillator strengths spread over multiple final states

Transition densities help characterize absorption peaks

Abstract

We report calculations of oscillator strengths for the far infrared absorption of light by the excitonic complexes Xn- (the excess charge, n, ranging from one to four) confined in quantum dots. The magnetic field is varied in an interval which corresponds to ``filling factors'' between 2 and 3/5. Electron-hole interaction effects are seen in the deviations of the peak positions from the Kohn lines, and in the spreading of the oscillator strengths over a few final states. Transition densities are used as an additional tool to characterize the absorption peaks.