Enhancement of the Binding Energy of Charged Excitons in Disordered Quantum Wires

TL;DR

This paper investigates how disorder in quantum wires affects the binding energy of charged excitons, revealing that localization and recoil energy significantly contribute, unlike in quantum dots.

Contribution

It demonstrates that charged excitons in disordered quantum wires are weakly localized and that recoil energy plays a major role in their binding energy enhancement.

Findings

Charged excitons are weakly localized in disordered quantum wires.

Recoil energy significantly contributes to binding energy enhancement.

Coulomb correlation is not the sole factor in binding energy in quantum wires.

Abstract

Negatively and positively charged excitons are identified in the spatially-resolved photoluminescence spectra of quantum wires. We demonstrate that charged excitons are weakly localized in disordered quantum wires. As a consequence, the enhancement of the "binding energy" of a charged exciton is caused, for a significant part, by the recoil energy transferred to the remaining charged carrier during its radiative recombination. We discover that the Coulomb correlation energy is not the sole origin of the "binding energy", in contrast to charged excitons confined in quantum dots.