Impact of the Hole Gas on Optically Detected Magnetic Resonance in (Cd,Mn)Te Based Quantum Well

TL;DR

This study investigates how the hole gas influences optically detected magnetic resonance in (Cd,Mn)Te quantum wells, revealing local carrier fluctuations and ion interactions through ODMR signal analysis.

Contribution

It provides new insights into carrier-ion interactions and local fluctuations in (Cd,Mn)Te quantum wells with hole gas using ODMR techniques.

Findings

Detection of local carrier density fluctuations.

Identification of separate Mn$^{2+}$ ion populations.

Information on magnetic ion temperature from ODMR shape.

Abstract

Optically detected magnetic resonance (ODMR) is a useful technique for studying interactions between local spins (magnetic ions) and carrier gas. We present the ODMR study of single (Cd,Mn)Te/(Cd,Mg)Te quantum wells (QWs) with the hole gas. We observe different characteristics of the ODMR signals obtained simultaneously using the optical signals of neutral and positively charged exciton. From that, we infer an existence of local fluctuations of carrier gas density resulting in separate populations of Mn$^{2+}$ ions. At the same time, the shape of the ODMR signal contains information about the temperature of the magnetic ions involved in the absorption of the MW. Studying it in detail provides even more information about the interactions with charge carriers. In the QW, two separate ensembles of ions are thermalized differently in the presence of carriers.