Polar optical phonons in wurtzite spheroidal quantum dots: theory and application to ZnO and ZnO/MgZnO nanostructures

被引：89

作者：

Fonoberov, VA ^{[1
]}

Balandin, AA ^{[1
]}

机构：

[1] Univ Calif Riverside, Dept Elect Engn, Nano Device Lab, Riverside, CA 92521 USA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2005年 / 17卷 / 07期

关键词：

D O I：

10.1088/0953-8984/17/7/003

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Polar optical-phonon modes are derived analytically for spheroidal quantum dots with wurtzite crystal structure. The developed theory is applied to freestanding spheroidal ZnO quantum dots and to spheroidal ZnO quantum dots embedded into a MgZnO crystal. The wurtzite (anisotropic) quantum dots are shown to have strongly different polar optical-phonon modes in comparison with zincblende (isotropic) quantum dots. The obtained results allow one to explain and accurately predict phonon peaks in the Raman spectra of wurtzite nanocrystals, nanorods (prolate spheroids), and epitaxial quantum dots (oblate spheroids).

引用

页码：1085 / 1097

页数：13

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