Magnetooptical Study of Zeeman Effect in Mn modulation-doped InAs/InGaAs/InAlAs Quantum Well Structures

TL;DR

This study investigates the Zeeman effect in Mn-doped InAs/InGaAs/InAlAs quantum wells using magneto-photoluminescence, revealing unexpectedly large splitting likely due to exchange interactions with manganese ions.

Contribution

It provides new insights into the Zeeman splitting behavior in Mn modulation-doped quantum wells, highlighting a significant deviation from expected giant Zeeman splitting values.

Findings

Observed two PL lines corresponding to free and bound Mn holes.

Splitting exceeds expected giant Zeeman splitting by two orders of magnitude.

Splitting behavior follows the Brillouin function, indicating exchange interaction.

Abstract

We report on a magneto-photoluminescence (PL) study of Mn modulation-doped InAs/InGaAs/InAlAs quantum wells. Two PL lines corresponding to the radiative recombination of photoelectrons with free and bound-on-Mn holes have been observed. In the presence of a magnetic field applied in the Faraday geometry both lines split into two circularly polarized components. While temperature and magnetic field dependences of the splitting are well described by the Brillouin function, providing an evidence for exchange interaction with spin polarized manganese ions, the value of the splitting exceeds the expected value of the giant Zeeman splitting by two orders of magnitude for a given Mn density. Possible reasons of this striking observation are discussed.