Electron states in CdMnSe/ZnSe and in CdSe/ZnMnSe diluted magnetic semiconductor quantum dots

Abstract

Self‐assembed quantum dots (QDs) based on II‐VI compounds are interesting with regard to their electronic and optical properties due to their large scale provided by their fundamental gap. Among II‐VI materials, diluted magnetic semiconductor (DMS) nanostructures like CdSe/ZnMnSe and CdMnSe/ZnSe QDs are of particular interest due to the exchange interaction between the spin of the carriers and the spin of the paramagnetic Mn2+ ions located in ternary alloy layers. The application of an external magnetic field at low temperature induce the so‐called giant Zeemann effect of the band edges. In this work we first report the band offset calculations for zinc blende pseudomorphically strained CdSe/ZnSe interface. Then, we calculate the lowest electron states in both (Cd,Mn)Se/ZnSe and in CdSe/(Zn,Mn)Se QDs. Results show that the giant Zeeman splitting is more important when the Mn ions are inside the dot. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

A magnetic quantum dot in a diluted magnetic semiconductor/semiconductor heterostructure

“…They have been studied for different geometries: a cylinder, a sphere, and a cuboid [19][20][21][22][23][24]. Interestingly, Triki et al [25] proposed the quantum dot heterostructure which is formed by CdMnSe (CdSe) in the shape of a truncated cone surrounded by ZnSe (ZnMnSe) and numerically studied the variation of electron energies as a function of a magnetic field. In the heterostructure, the potential due to the band offset, which is discussed intensively, plays a major role in electron confinement while the giant Zeeman potential only leads to energy splitting of spin up and spin down states.…”

Coaxial Quantum Well Wires in Magnetic/Nonmagnetic Heterostructures

“…After the discovery of the giant Zeeman effect in a DMS, it becomes a promising candidate material for spintronic application. An example of applying a DMS in spintronics is the DMS‐based quantum dot . Based on the concept that spin up and spin down electrons feel different potentials in a DMS, controlling the localization of spin states is possible in the quantum dot which will be useful for spin‐based memories.…”

“…An example of applying a DMS in spintronics is the DMS-based quantum dot. [20][21][22] Based on the concept that spin up and spin down electrons feel different potentials in a DMS, controlling the localization of spin states is possible in the quantum dot which will be useful for spin-based memories. Moreover, a spin-polarized current can be obtained by a DMS tunnel junction.…”