Optical spin control in nanocrystalline magnetic nanoswitches
C. Echeverr\'ia-Arrondo, J. P\'erez-Conde, and A. Ayuela
TL;DR
This study explores how optical excitation can manipulate spin states in (Cd,Mn)Te quantum dots, revealing potential for light-controlled spin-based quantum operations.
Contribution
It demonstrates that optical excitation can induce spin flips in Mn-doped quantum dots, enabling light-controlled spin manipulation for quantum applications.
Findings
Optical excitation causes Mn spins to flip from antiparallel to parallel.
Parallel Mn spin configuration is energetically favored for optically active excitons.
Potential for (Cd,Mn)Te QDs in spin-based quantum information processing.
Abstract
We investigate the optical properties of (Cd,Mn)Te quantum dots (QDs) by looking at the excitons as a function of the Mn impurities positions and their magnetic alignments. When doped with two Mn impurities, the Mn spins, aligned initially antiparallel in the ground state, have lower energy in the parallel configuration for the optically active spin-up exciton. Hence, the photoexcitation of the QD ground state with antiparallel Mn spins induces one of them to flip and they align parallel. This suggests that (Cd,Mn)Te QDs are suitable for spin-based operations handled by light.
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