# Magnetic field-induced exchange effects between Mn ions and free carriers in ZnSe quantum well through the intermediate nonmagnetic barrier studied by photoluminescence

**Authors:** D. M. Zayachuk, T. Slobodskyy, G. V. Astakhov, A. Slobodskyy, C. Gould, G. Schmidt, W. Ossau, L. W. Molenkamp  
**arXiv:** [1101.0251](https://arxiv.org/abs/1101.0251)  
**Date:** 2010-12-31  
**Summary page:** https://www.summarizepaper.com/en/paper/1101.0251v2/

## Key points

- The study investigates photoluminescence (PL) of structures consisting of a semimagnetic barrier, an intermediate nonmagnetic barrier, a quantum well, and a layer at low temperature.
- The rate of shift in different PL bands is estimated as a function of magnetic field and thickness of the intermediate barrier.
- Deformation caused by adjacent layers plays a crucial role in forming Mn complexes in the semimagnetic barrier layer.
- Changes in band gap and donor/acceptor level energies due to biaxial compression caused by the intermediate barrier are analyzed.
- The effect of giant Zeeman splitting on energy levels within the structure is significantly affected by the intermediate barrier.
- The results indicate that the intermediate barrier not only determines luminescence properties but also affects polarization and movement of energy levels within the quantum well exciton emission under magnetic fields.

## Summary

The study investigates the photoluminescence (PL) of structures consisting of a 50 nm $Zn_{0.9}Be_{0.05}Mn_{0.05}Se$ semimagnetic barrier, a nonmagnetic intermediate barrier of thickness $d$ nm $Zn_{0.943}Be_{0.057}Se$, a 2.5 nm $ZnSe$ quantum well, and a 30 nm $Zn_{0.943}Be_{0.057}Se$ layer at a temperature of 1.2 K as a function of magnetic field ($B$) and thickness ($d$) of the intermediate barrier. The rate of shift in different PL bands under low and high magnetic fields is estimated, and the causes for the increase in shift rate from low to high magnetic fields are interpreted. The study presents peculiarities regarding the effect of the intermediate barrier on luminescence properties, where deformation caused by adjacent layers plays a crucial role in forming Mn complexes in the $Zn_{0.9}Be_{0.05}Mn_{0.05}Se$ layer. Furthermore, changes in band gap and donor/acceptor level energies due to biaxial compression caused by the intermediate barrier are analyzed, along with an appreciable change in the effect of giant Zeeman splitting on energy levels within the structure. The results indicate that not only does the intermediate barrier play an important role in determining luminescence properties but also significantly affects polarization and movement of energy levels within the quantum well exciton emission under magnetic fields, highlighting its potential use for future applications in spintronics and optoelectronics technologies.