Robust Magnetic Polarons in Type-II (Zn,Mn)Te Quantum Dots
I. R. Sellers, R. Oszwaldowski, V. R. Whiteside, M. Eginligil, A., Petrou, I. Zutic, W-C. Chou, W. C. Fan, A. G. Petukhov, B. D. McCombe
TL;DR
This paper demonstrates the existence of magnetic polarons in type-II (Zn,Mn)Te quantum dots, showing magnetic ordering up to 200 K and revealing unique magnetic properties influenced by Mn spin interactions.
Contribution
It provides experimental evidence of magnetic ordering in (Zn,Mn)Te quantum dots and characterizes their magnetic properties and behavior.
Findings
Magnetic polarons detected at temperatures up to 200 K
Binding energy of magnetic polarons is approximately 40 meV
Unusually small Zeeman shift observed under magnetic field
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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