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

被引：56

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.

引用

页数：7

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