Magnetoswitching of current oscillations in diluted magnetic semiconductor nanostructures

TL;DR

This paper investigates nonlinear charge and spin transport phenomena, including current oscillations and spin polarization, in Diluted Magnetic Semiconductor multiquantum wells, highlighting their potential for spintronic device applications.

Contribution

It provides a systematic analysis of charge and spin responses to voltage and magnetic field switching in DMS multiquantum wells, revealing stable oscillatory and spin-polarized states.

Findings

Oscillatory regions expand with more wells and higher level splitting.

Stable spin-polarized stationary and oscillatory states identified.

Transitions between states are controllable via voltage and magnetic field.

Abstract

Strongly nonlinear transport through Diluted Magnetic Semiconductor multiquantum wells occurs due to the interplay between confinement, Coulomb and exchange interaction. Nonlinear effects include the appearance of spin polarized stationary states and self-sustained current oscillations as possible stable states of the nanostructure, depending on its configuration and control parameters such as voltage bias and level splitting due to an external magnetic field. Oscillatory regions grow in size with well number and level splitting. A systematic analysis of the charge and spin response to voltage and magnetic field switching of II-VI Diluted Magnetic Semiconductor multiquantum wells is carried out. The description of stationary and time-periodic spin polarized states, the transitions between them and the responses to voltage or magnetic field switching have great importance due to the potential implementation of spintronic devices based on these nanostructures.