An off-center donor and nonlinear absorption spectra of spherical quantum dots

被引：32
|
作者：
Yuan, Jianhui [1 ]
Xie, Wenfang [1 ]
He, Lili [1 ]
机构：
[1] Guangzhou Univ, Coll Phys & Elect Engn, Dept Phys, Guangzhou 510006, Guangdong, Peoples R China
来源：
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2009年 / 41卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Optical absorption; Donor; Quantum dot; Binding energy; BINDING-ENERGY; PARABOLIC CONFINEMENT; HYDROGENIC-DONOR; IMPURITY STATES; PERTURBATION CALCULATION; OPTICAL-ABSORPTION; SEMICONDUCTOR; ELECTRON; WELL;
D O I：
10.1016/j.physe.2008.12.012
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In the present work, off-center donor impurity, the linear and the third-order nonlinear absorption coefficients have been studied by using perturbation method. Numerical results for typical GaAs material show the quantum size effect. Also, we find that the size of the dot, and the position of impurity have a great effect on the linear, the nonlinear and the total absorption coefficients. Additionally, the total optical absorption saturation intensity can be controlled by the size of dot or the incident optical intensity. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.
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页码：779 / 785
页数：7
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