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

被引：14

作者：

Barman, B. ^{[1
]}

Oszwaldowski, R. ^{[1
,2
]}

Schweidenback, L. ^{[1
]}

Russ, A. H. ^{[1
]}

Pientka, J. M. ^{[1
,3
]}

Tsai, Y. ^{[1
]}

Chou, W-C. ^{[4
]}

Fan, W. C. ^{[4
]}

Murphy, J. R. ^{[1
]}

Cartwright, A. N. ^{[5
]}

Sellers, I. R. ^{[6
]}

Petukhov, A. G. ^{[2
]}

Zutic, I. ^{[1
]}

McCombe, B. D. ^{[1
]}

Petrou, A. ^{[1
]}

机构：

[1] SUNY Buffalo, Dept Phys, Buffalo, NY 14260 USA

[2] South Dakota Sch Mines & Technol, Dept Phys, Rapid City, SD 57701 USA

[3] St Bonaventure Univ, Dept Phys, St Bonaventure, NY 14778 USA

[4] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 300, Taiwan

[5] SUNY Buffalo, Dept Elect & Elect Engn, Buffalo, NY 14260 USA

[6] Univ Oklahoma, Dept Phys & Astron, Norman, OK 73019 USA

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 03期

基金：

美国国家科学基金会;

关键词：

SEMICONDUCTOR NANOCRYSTALS; FERROMAGNETISM; FLUCTUATIONS; TEMPERATURE; WELLS;

D O I：

10.1103/PhysRevB.92.035430

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：8

共 62 条

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