14.7.25

Article: Impact of the hole gas on optically detected magnetic resonance in (Cd,Mn)⁢Te-based quantum wells

Optically detected magnetic resonance (ODMR) is a powerful method for investigating the interactions between localized magnetic spins (such as magnetic ions) and the surrounding carrier gas. In this study, we apply ODMR to a single (Cd,Mn)Te/(Cd,Mg)Te quantum well (QW) containing a hole gas. By simultaneously analyzing ODMR signals associated with both neutral and positively charged excitons, we observe distinct signal characteristics. These differences suggest local fluctuations in carrier gas density, leading to separate populations of Mn²⁺ ions.

Additionally, the shape of the ODMR signal carries information about the effective temperature of the magnetic ions absorbing the microwave radiation. A detailed analysis of this signal provides deeper insights into the interactions between magnetic ions and charge carriers. Within the quantum well, we identify two distinct groups of Mn²⁺ ions, each reaching thermal equilibrium differently due to the presence of the carrier gas.

Authors: Aleksandra Łopion, Aleksander Bogucki, Mateusz Raczyński, Zuzanna Śnioch, Karolina Ewa Połczyńska, Wojciech Pacuski, Tomasz Kazimierczuk, Andrzej Golnik and Piotr Kossacki

Physical Review B 111, 035307

Published 28 January 2025

https://doi.org/10.1103/PhysRevB.111.035307