Temperature Effects on Exciton and Trion States in CdTe Quantum Well Structures

TL;DR

This study investigates how temperature influences exciton and trion photoluminescence spectra in CdTe quantum wells under high magnetic fields, revealing complex redistribution behaviors not explained by simple models.

Contribution

The paper introduces a rate equation model that accurately describes the temperature-dependent PL intensity redistribution of excitons and trions in quantum wells.

Findings

Temperature causes opposite redistribution of exciton and trion PL intensities.

The rate equation model aligns well with experimental observations.

Temperature effects deviate from simple Boltzmann distribution predictions.

Abstract

We study the temperature-dependent modifications of trion and exciton photoluminescence (PL) spectra in modulation-doped CdTe/CdMgTe quantum wells in high magnetic field. We find that, in magnetic field, the temperature-dependent redistribution of exciton and trion PL intensities is opposite to that expected from a simple Boltzmann distribution model. Solving a system of rate equations that describe the exciton-trion energy levels, we calculate the temperature dependence of the exciton and trion PL intensities. The calculations show good agreement with the experimental data.