Title: | Time-resolved magnetophotoluminescence studies of magnetic polaron dynamics in type-II quantum dots |
Authors: | Barman, B. Oszwaldowski, 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. Zutic, I. McCombe, B. D. Petrou, A. 電子物理學系 Department of Electrophysics |
Issue Date: | 24-Jul-2015 |
Abstract: | We used continuous wave photoluminescence (cw-PL) and time-resolved photoluminescence (TR-PL) 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-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-MP decreasing with increasing temperature T and increasing magnetic field B. In contrast, E-MP in the (Zn, Mn)Te/ZnSe system has unconventional dependence on temperature T and magnetic field B; E-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. |
URI: | http://dx.doi.org/10.1103/PhysRevB.92.035430 http://hdl.handle.net/11536/128029 |
ISSN: | 2469-9950 |
DOI: | 10.1103/PhysRevB.92.035430 |
Journal: | PHYSICAL REVIEW B |
Volume: | 92 |
Issue: | 3 |
Begin Page: | 0 |
End Page: | 0 |
Appears in Collections: | Articles |
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