Circular Polarization Dynamics during Magnetic Polaron Formation in Type-II Magnetic Quantum Dots

被引：7

作者：

Barman, Biplob ^{[1
]}

Pientka, James M. ^{[2
]}

Murphy, Joseph R. ^{[3
]}

Cartwright, Alexander N. ^{[4
]}

Chou, Wu-Ching ^{[5
]}

Fan, Wen-Chung ^{[5
]}

Oszwaldowski, Rafal ^{[6
]}

Petrou, Athos ^{[3
]}

机构：

[1] Univ Michigan, Dept Comp Sci Engn & Phys, Flint, MI 48502 USA

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

[3] Univ Buffalo SUNY, Dept Phys, Buffalo, NY 14260 USA

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

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

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

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2020年 / 124卷 / 23期

关键词：

BAND;

D O I：

10.1021/acs.jpcc.0c02723

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We used time-resolved photoluminescence spectroscopy to study the circular polarization dynamics of magnetic polarons in type-II (Zn,Mn)Te/ZnSe quantum dots in the presence of an external magnetic field. We investigated the time evolution of the peak energy of the sigma(+) and sigma(-) circularly polarized photoluminescence components and of the circular polarization of the emitted light. We also observed that the value of circular polarization, at long delay times, increases with magnetic field. We found that this system exhibits unexpected characteristics, such as different time scales for the formation of the magnetic polaron, on the one hand, and the evolution of photoluminescence circular polarization, on the other hand. These results are discussed within the framework of a theoretical model developed to describe the dependence of magnetic susceptibility as a function of temperature.

引用

页码：12766 / 12773

页数：8

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