Robust Magnetic Polarons in Type-II (Zn,Mn)Te Quantum Dots

Abstract

We present evidence of magnetic ordering in type-II (Zn, Mn) Te quantum dots. This ordering is attributed to the formation of bound magnetic polarons caused by the exchange interaction between the strongly localized holes and Mn within the dots. In our photoluminescence studies, the magnetic polarons are detected at temperatures up to ~ 200 K, with a binding energy of ~ 40 meV. In addition, these dots display an unusually small Zeeman shift with applied field (2 meV at 10 T). This behavior is explained by a small and weakly temperature-dependent magnetic susceptibility due to anti-ferromagnetic coupling of the Mn spins.

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• Direct Measurements of Magnetic Polarons in Cd${}_{1-x}$Mn${}_x$Se Nanocrystals from Resonant Photoluminescence
• Magnetism in Closed-shell Quantum Dots: Emergence of Magnetic Bipolarons
• Theory of quantum dot spin-lasers
• Spin dynamics of a confined electron interacting with magnetic or nuclear spins: A semiclassical approach
• Time-resolved magnetophotoluminescence studies of magnetic polaron dynamics in type-II quantum dots
• Magnetic anisotropies of quantum dots
• Influence of exciton spin relaxation on the photoluminescence spectra of semimagnetic quantum dots
• Spin ordering in magnetic quantum dots: From core-halo to Wigner molecules
• Reentrant Formation of Magnetic Polarons in Quantum Dots
• Nodal "ground states" and orbital textures in semiconductor quantum dots
• Spin-orbit coupled particle in a spin bath
• Magnetic ordering in quantum dots: Open vs. closed shells
• Multiband Electronic Structure of Magnetic Quantum Dots: Numerical Studies