Photoluminescence signatures of negatively charged magnetoexcitons

TL;DR

This paper numerically investigates the photoluminescence signatures of negatively charged magnetoexcitons in quantum dots under magnetic fields, providing a detailed explanation of experimental spectra and exciton state structures.

Contribution

It offers a quantitative analysis of PL spectra of charged excitons with in-plane confinement and magnetic fields, including shakeup processes, and explores exciton state structures.

Findings

PL spectra explained quantitatively

Charged exciton states characterized

Competition between ionization effects observed

Abstract

The negatively charged quasi-two-dimensional exciton ($X^-$) is studied numerically in the presence of a uniform B-field and various in-plane confinements. The corresponding photoluminescence (PL) spectra, including shakeup processes, are calculated. These calculations provide a quantitative explanation of recent experimental PL spectra. The photoluminescence signatures of charged excitons in quantum dots are also examined. Electron-hole pair distriution functions are calculated which show the structure of the charged exciton states (both ground and excited states). Increasing excitation reflects a competition between two effects: partial ionization of either one or two electrons.