Robust magnetic polarons in type-II (Zn,Mn)Te/ZnSe magnetic quantum dots

I. R. Sellers; R. Oszwałdowski; V. R. Whiteside; M. Eginligil; A. Petrou; I. Zutic; W. C. Chou; W. C. Fan; A. G. Petukhov; S. J. Kim; A. N. Cartwright; B. D. McCombe

doi:10.1103/PhysRevB.82.195320

Robust magnetic polarons in type-II (Zn,Mn)Te/ZnSe magnetic quantum dots

I. R. Sellers, R. Oszwałdowski, V. R. Whiteside, M. Eginligil, A. Petrou, I. Zutic, W. C. Chou, W. C. Fan, A. G. Petukhov, S. J. Kim, A. N. Cartwright, B. D. McCombe

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Abstract

We present a magneto-optical study of magnetic polarons in type-II (Zn,Mn) Te quantum dots. The polarons are formed due to the exchange coupling between the spins of the holes and those of the Mn ions, both of which are localized in the dots. In our photoluminescence studies, the magnetic polarons are detected at temperatures up to ∼150 K, with a formation energy of ∼40 meV. The emission from these dots exhibits an unusually small Zeeman shift with applied magnetic field (∼2 meV at 8 T) and at the same time a very large circular polarization. We attribute this apparently contradictory behavior by a low and weakly temperature-dependent magnetic susceptibility due to antiferromagnetic coupling of the Mn spins.

Original language	English (US)
Article number	195320
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	82
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevB.82.195320
State	Published - Nov 18 2010
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.82.195320

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Sellers, I. R., Oszwałdowski, R., Whiteside, V. R., Eginligil, M., Petrou, A., Zutic, I., Chou, W. C., Fan, W. C., Petukhov, A. G., Kim, S. J., Cartwright, A. N., & McCombe, B. D. (2010). Robust magnetic polarons in type-II (Zn,Mn)Te/ZnSe magnetic quantum dots. Physical Review B - Condensed Matter and Materials Physics, 82(19), [195320]. https://doi.org/10.1103/PhysRevB.82.195320

Robust magnetic polarons in type-II (Zn,Mn)Te/ZnSe magnetic quantum dots. / Sellers, I. R.; Oszwałdowski, R.; Whiteside, V. R.; Eginligil, M.; Petrou, A.; Zutic, I.; Chou, W. C.; Fan, W. C.; Petukhov, A. G.; Kim, S. J.; Cartwright, A. N.; McCombe, B. D.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 19, 195320, 18.11.2010.

Research output: Contribution to journal › Article › peer-review

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abstract = "We present a magneto-optical study of magnetic polarons in type-II (Zn,Mn) Te quantum dots. The polarons are formed due to the exchange coupling between the spins of the holes and those of the Mn ions, both of which are localized in the dots. In our photoluminescence studies, the magnetic polarons are detected at temperatures up to ∼150 K, with a formation energy of ∼40 meV. The emission from these dots exhibits an unusually small Zeeman shift with applied magnetic field (∼2 meV at 8 T) and at the same time a very large circular polarization. We attribute this apparently contradictory behavior by a low and weakly temperature-dependent magnetic susceptibility due to antiferromagnetic coupling of the Mn spins.",

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AU - Eginligil, M.

AU - Petrou, A.

AU - Zutic, I.

AU - Chou, W. C.

AU - Fan, W. C.

AU - Petukhov, A. G.

AU - Kim, S. J.

AU - Cartwright, A. N.

AU - McCombe, B. D.

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N2 - We present a magneto-optical study of magnetic polarons in type-II (Zn,Mn) Te quantum dots. The polarons are formed due to the exchange coupling between the spins of the holes and those of the Mn ions, both of which are localized in the dots. In our photoluminescence studies, the magnetic polarons are detected at temperatures up to ∼150 K, with a formation energy of ∼40 meV. The emission from these dots exhibits an unusually small Zeeman shift with applied magnetic field (∼2 meV at 8 T) and at the same time a very large circular polarization. We attribute this apparently contradictory behavior by a low and weakly temperature-dependent magnetic susceptibility due to antiferromagnetic coupling of the Mn spins.

AB - We present a magneto-optical study of magnetic polarons in type-II (Zn,Mn) Te quantum dots. The polarons are formed due to the exchange coupling between the spins of the holes and those of the Mn ions, both of which are localized in the dots. In our photoluminescence studies, the magnetic polarons are detected at temperatures up to ∼150 K, with a formation energy of ∼40 meV. The emission from these dots exhibits an unusually small Zeeman shift with applied magnetic field (∼2 meV at 8 T) and at the same time a very large circular polarization. We attribute this apparently contradictory behavior by a low and weakly temperature-dependent magnetic susceptibility due to antiferromagnetic coupling of the Mn spins.

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Robust magnetic polarons in type-II (Zn,Mn)Te/ZnSe magnetic quantum dots

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