| CdSe量子点系统的库仑相互作用能的量子尺寸效应 |
| |
| 引用本文： | 惠萍,黄纲明. CdSe量子点系统的库仑相互作用能的量子尺寸效应[J]. 中山大学学报(自然科学版), 2004, 43(4): 38-40 |
| |
| 作者姓名： | 惠萍 黄纲明 |
| |
| 作者单位： | 1. 广东教育学院物理系,广东,广州,510303
2. 中山大学物理系,广东,广州,510275 |
| |
| 基金项目： | 国家自然科学基金，广东省自然科学基金，广东教育学院校科研和教改项目 |
| |
| 摘 要： | 用有效质量近似(EMA)模型模拟CdSe半导体微晶量子点系统,计算激子的基态能量以及系统的库仑相互作用能.在量子点的尺寸为0.25～2.5nm的区域内,将计算结果与实验结果进行比较显示:①激子的基态能量在整个区域与实验结果符合得很好;②系统的库仑相互作用能具有明显的量子尺寸效应;③包围量子点的外部介质的介电常数对库仑相互作用能的影响十分显著.计算结果表明:在CdSe量子点系统的研究中,考虑量子点内外介电常数的不同是必要的,系统的库仑相互作用能对激子的基态能量的贡献是十分重要的.
|
| 关 键 词： | 量子点 介电常数 有效质量 |
| 文章编号： | 0529-6579(2004)04-0038-03 |
| 修稿时间： | 2004-01-02 |
Quantum Size Effects on the Coulomb Interaction Energy of Electron and Hone in the CdSe Semiconductor Crystallites Quantum Dots |
| |
| HUI Ping,HUANG Gang-ming. Quantum Size Effects on the Coulomb Interaction Energy of Electron and Hone in the CdSe Semiconductor Crystallites Quantum Dots[J]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2004, 43(4): 38-40 |
| |
| Authors: | HUI Ping HUANG Gang-ming |
| |
| Affiliation: | HUI Ping~1,HUANG Gang-ming~2 |
| |
| Abstract: | The effective mass approximation (EMA) model is used to describe CdSe semiconductor crystallites quantum dots, and calculate the exciton ground state energy and Coulomb interaction energy of the electron with hone.Exciton energies as a function of the dots radii are calculated and compared with experimental and other theoretical data.The results of the excition energy are in good agreement with experimental data in the all the regions than other ones.The Coulomb interaction energy of the system is size dependent.Dielectric constant outside the dots affects Coulomb interaction energy of the system clearly. It is turn out that consideration the deference of dielectric constant between inside and outside of the dots is necessary. |
| |
| Keywords: | quantum dots dielectric constant effective mass approximation |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
