Anomalous Circular Polarization of Photoluminescence Spectra of Individual CdSe Nanocrystals in an Applied Magnetic Field

被引：52

作者：

Htoon, H. ^{[1
,2
]}

Crooker, S. A. ^{[3
]}

Furis, M. ^{[3
]}

Jeong, S. ^{[1
,2
]}

Efros, Al. L. ^{[4
]}

Klimov, V. I. ^{[1
,2
]}

机构：

[1] Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA

[2] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[3] Natl High Magnet Field Lab, Los Alamos, NM 87545 USA

[4] USN, Res Lab, Washington, DC 20375 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 01期

关键词：

SEMICONDUCTOR QUANTUM DOTS; EXCITON FINE-STRUCTURE; EXCHANGE INTERACTION; SPIN RELAXATION; HEAVY-HOLE; ELECTRON; WELLS; STATES; DARK;

D O I：

10.1103/PhysRevLett.102.017402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the low-temperature magnetophotoluminescence from individual CdSe nanocrystals. Nanocrystals having a small "bright" exciton fine structure splitting (Delta(XY)< 0.5 meV) exhibit a conventional left and right circularly polarized Zeeman photoluminescence doublet in applied magnetic fields. In contrast, nanocrystals with large Delta(XY) (> 1 meV) show an anomalous magnetophotoluminescence polarization, wherein the lower-energy peak becomes circularly polarized with increasing field, while the higher-energy peak remains linearly polarized. This unusual behavior arises from strong mixing between the absorbing and emitting bright exciton levels due to strong anisotropic exchange interactions.

引用

页数：4

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