Band structure of semimagnetic Hg1-yMnyTe quantum wells

TL;DR

This paper models the electronic band structure of semimagnetic Hg_1-yMn_yTe quantum wells, incorporating exchange interactions, and compares calculations with experimental data to understand their transport properties.

Contribution

It introduces an eight-band kp model combined with a mean field approach to analyze the band structure of semimagnetic quantum wells with Mn doping.

Findings

Calculated Landau level fan diagram matches experimental data

Model explains influence of confinement and exchange interaction on transport

Provides a tool for interpreting magnetic and electronic properties

Abstract

The band structure of semimagnetic Hg_1-yMn_yTe/Hg_1-xCd_xTe type-III quantum wells has been calculated using eight-band kp model in an envelope function approach. Details of the band structure calculations are given for the Mn free case (y=0). A mean field approach is used to take the influence of the sp-d exchange interaction on the band structure of QW's with low Mn concentrations into account. The calculated Landau level fan diagram and the density of states of a Hg_0.98Mn_0.02Te/Hg_0.3Cd_0.7Te QW are in good agreement with recent experimental transport observations. The model can be used to interpret the mutual influence of the two-dimensional confinement and the sp-d exchange interaction on the transport properties of Hg_1-yMn_yTe/Hg_1-xCd_xTe QW's.