Linearly polarized 'fine structure' of the bright exciton state in individual CdSe nanocrystal quantum dots

被引：54
|
作者：
Htoon, H. [1 ]
Furis, M. [2 ]
Crooker, S. A. [2 ]
Jeong, S. [1 ]
Klimov, V. I. [1 ]
机构：
[1] Los Alamos Natl Lab, Ctr Integrated Nanotechnologies, Div Chem, Los Alamos, NM 87545 USA
[2] Los Alamos Natl Lab, Natl High Magnet Fields Lab, Los Alamos, NM 87545 USA
来源：
PHYSICAL REVIEW B | 2008年 / 77卷 / 03期
关键词：
D O I：
10.1103/PhysRevB.77.035328
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report polarization-resolved, low-temperature, high-spectral-resolution studies of the photoluminescence from individual CdSe nanocrystal quantum dots (NQDs). The spectra reveal a 'fine structure' splitting of the bright exciton state in a subset of the studied NQDs. The two fine structure states are spectrally separated by an energy of up to 3 meV depending on NQD size and are characterized by linearly (and orthogonally) polarized emission dipoles. The average splitting scales approximately with inverse NQD volume, consistent with an anisotropic electron-hole exchange interaction which can result from a breakdown of cylindrical symmetry in some of the NQDs.
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页数：7
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