Excitonic and quasiparticle gaps in Si nanocrystals

被引：162

作者：

Delerue, C ^{[1
]}

Lannoo, M ^{[1
]}

Allan, G ^{[1
]}

机构：

[1] Dept Inst Super Elect Nord, Inst Elect & Microelect Nord, F-59046 Lille, France

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.84.2457

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present calculations of the one- and two-particle excitations in silicon nanocrystals. The one-particle properties are handled in the GW approximation, and the excitonic gap is obtained from the Bethe-Salpeter equation. We develop a tight binding version of these methods to treat clusters up to 275 atoms. The self-energy and Coulomb corrections almost exactly cancel each other for crystallites with radius larger than 0.6 nm. The result of this cancellation is that one-particle calculations give quite accurate values for the excitonic gap of crystallites in the most studied range of sizes.

引用

页码：2457 / 2460

页数：4

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