Time-resolved magnetophotoluminescence studies of magnetic polaron dynamics in type-II quantum dots

We used continuous wave photoluminescence (cw-PL) and time-resolved photoluminescence (TRPL) spectroscopy to compare the properties of magnetic polarons (MP) in two related spatially indirect II-VI epitaxially grown quantum dot systems. In the ZnTe / (Zn, Mn)Se system the holes are confined in the n...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2015-07, Vol.92 (3), Article 035430
Main Authors: Barman, B., Oszwałdowski, R., Schweidenback, L., Russ, A. H., Pientka, J. M., Tsai, Y., Chou, W-C., Fan, W. C., Murphy, J. R., Cartwright, A. N., Sellers, I. R., Petukhov, A. G., Žutić, I., McCombe, B. D., Petrou, A.
Format: Article
Language:English
Subjects:
Dynamical systems
Dynamics
Magnetic fields
Magnetic properties
Polarons
Quantum dots
Zinc selenides
Zinc tellurides
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Summary:We used continuous wave photoluminescence (cw-PL) and time-resolved photoluminescence (TRPL) spectroscopy to compare the properties of magnetic polarons (MP) in two related spatially indirect II-VI epitaxially grown quantum dot systems. In the ZnTe / (Zn, Mn)Se system the holes are confined in the nonmagnetic ZnTe quantum dots (QDs), and the electrons reside in the magnetic (Zn,Mn)Se matrix. On the other hand, in the (Zn, Mn)Te / ZnSe system, the holes are confined in the magnetic (Zn,Mn)Te QDs, while the electrons remain in the surrounding nonmagnetic ZnSe matrix. The magnetic polaron formation energies E sub(MP) in both systems were measured from the temporal redshift of the band-edge emission. The magnetic polaron exhibits distinct characteristics depending on the location of the Mn ions. In the ZnTe / (Zn, Mn)Se system the magnetic polaron shows conventional behavior with E sub(MP) decreasing with increasing temperature T and increasing magnetic field B. In contrast, E sub(MP) in the (Zn, Mn)Te / ZnSe system has unconventional dependence on temperature T and magnetic field B; E sub(MP) is weakly dependent on T as well as on B. We discuss a possible origin for such a striking difference in the MP properties in two closely related QD systems.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.92.035430