Multiquantum well spin oscillator

TL;DR

This paper investigates spin-polarized current oscillations in Mn-doped multiquantum well structures, identifying the minimal conditions such as number of wells and doping levels necessary for oscillations to occur.

Contribution

It introduces a nonlinear spin transport model to determine the minimal number of wells and doping conditions required for self-sustained spin oscillations in these structures.

Findings

Oscillations occur with at least four wells.

Specific doping densities and spin splitting ranges are identified.

Without magnetic impurities, only stationary states are observed.

Abstract

A dc voltage biased II-VI semiconductor multiquantum well structure attached to normal contacts exhibits self-sustained spin-polarized current oscillations if one or more of its wells are doped with Mn. Without magnetic impurities, the only configurations appearing in these structures are stationary. Analysis and numerical solution of a nonlinear spin transport model yield the minimal number of wells (four) and the ranges of doping density and spin splitting needed to find oscillations.