Optically Induced Magnetization of CdMnTe Self-Assembled Quantum Dots

TL;DR

This paper demonstrates that resonant optical excitation of CdMnTe quantum dots induces stable, spin-polarized magnetic polarons at zero magnetic field, with stability extending above 120 K due to quantum confinement effects.

Contribution

It introduces a method to optically induce and stabilize magnetic polarons in CdMnTe quantum dots at high temperatures, highlighting the role of quantum confinement.

Findings

Magnetic polarons are created at B=0 T in CdMnTe quantum dots.

Optical excitation leads to spin polarization stable above 120 K.

Quantum confinement enhances polaron stability.

Abstract

We demonstrate that resonant excitation of CdMnTe self-assembled quantum dots creates an ensemble of spin-polarized magnetic polarons at B=0 T. The strong spatial confinement characteristic of quantum dots significantly increases the stability of magnetic polarons so that the optically induced spin alignment is observed for temperatures > 120 K.