Trion dynamics in coupled double quantum wells. Electron density effects

TL;DR

This paper investigates the coherent dynamics of electrons in asymmetric double quantum wells, focusing on how electron density influences trion formation and electron oscillations, and proposes a detection method for trions via emitted radiation or current.

Contribution

It introduces a detailed analysis of electron, exciton, and trion interactions in quantum wells using matrix density formalism, highlighting the impact of electron density on electron dynamics and proposing a novel detection approach.

Findings

Electron density significantly modifies free electron inter-sublevel oscillations.

Trion formation affects the coherent electron dynamics.

A method for detecting trions via electromagnetic radiation or current is proposed.

Abstract

We have studied the coherent dynamics of injected electrons when they are either free or bounded both in excitons and in trions (charged excitons). We have considered a remotely doped asymmetric double quantum well where an excess of free electrons and the direct created excitons generate trions. We have used the matrix density formalism to analyze the electron dynamics for different concentration of the three species. Calculations show a significant modification of the free electron inter-sublevel oscillations cWe have studied the coherent dynamics of injected electrons when they are aused by electrons bound in excitons and trions. Based on the present calculations we propose a method to detect trions through the emitted electromagnetic radiation or the current density.