Identification of the local vibrational modes of small nitrogen clusters in dilute GaAsN

被引：6

作者：

Carvalho, A. ^{[1
]}

Barker, S. J. ^{[2
]}

Jones, R. ^{[1
]}

Williams, R. S. ^{[2
]}

Ashwin, M. J. ^{[2
]}

Newman, R. C. ^{[2
]}

Stavrinou, P. N. ^{[2
]}

Parry, G. ^{[2
]}

Jones, T. S. ^{[2
]}

Oberg, S. ^{[3
]}

Briddon, P. R. ^{[4
]}

机构：

[1] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England

[2] Univ London Imperial Coll Sci Technol & Med, Ctr Elect Mat & Devices, London SW7 2AZ, England

[3] Lulea Univ Technol, Dept Math, S-97187 Lulea, Sweden

[4] Univ Newcastle Upon Tyne, Sch Nat Sci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

来源：

PHYSICA B-CONDENSED MATTER | 2007年 / 401卷

基金：

英国工程与自然科学研究理事会;

关键词：

GaAs; dilute nitrides; nitrogen clusters; LVMs;

D O I：

10.1016/j.physb.2007.08.182

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Ultra-high-resolution infra-red local vibrational mode (IR LVM) spectroscopy measurements together with density-functional calculations have been used to identify the signatures of close substitutional nitrogen (N-As) pairs in GaAs1-xNx alloys with concentrations of x<0.025. We show that the presence of sub-peaks close to the N-As absorption band can be attributed to nitrogen pairs up to fourth neighbor position. Additionally, we suggest that the nitrogen pairs which give rise to the deepest levels below the conduction band edge are the first to be removed upon annealing. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：339 / 342

页数：4

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