极化子效应对ZnS/CdSe核壳量子点光吸收系数的影响

陈知红; 李钱光; 易煦农; 余华清; 熊良斌

doi:10.3788/fgxb20173805.0580

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极化子效应对ZnS/CdSe核壳量子点光吸收系数的影响

材料合成及性能 | 更新时间：2020-08-12

- 极化子效应对ZnS/CdSe核壳量子点光吸收系数的影响
- Polaron Effects on The Optical Absorption Coefficients in A Cylindrical ZnS/CdSe Core-Shell Quantum Dot
- 发光学报 2017年38卷第5期页码：580-586
- 作者机构：
  
  湖北工程学院物理与电子信息工程学院, 湖北孝感 432000
- 作者简介：
- 基金信息：
  
  国家自然科学基金（11547018）;湖北省教育厅研究项目（Q20142706）;湖北工程学院自然科学基金（z2013028）;湖北省自然科学基金（2014CFB579）资助项目
- DOI：10.3788/fgxb20173805.0580
  中图分类号： O472.3;O437
- 纸质出版日期：2017-5-5，
  
  收稿日期：2016-12-13，
  
  修回日期：2017-2-3，
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陈知红, 李钱光, 易煦农等. 极化子效应对ZnS/CdSe核壳量子点光吸收系数的影响[J]. 发光学报, 2017,38(5): 580-586

CHEN Zhi-hong, LI Qian-guang, YI Xu-nong etc. Polaron Effects on The Optical Absorption Coefficients in A Cylindrical ZnS/CdSe Core-Shell Quantum Dot[J]. Chinese Journal of Luminescence, 2017,38(5): 580-586
陈知红, 李钱光, 易煦农等. 极化子效应对ZnS/CdSe核壳量子点光吸收系数的影响[J]. 发光学报, 2017,38(5): 580-586 DOI： 10.3788/fgxb20173805.0580.

CHEN Zhi-hong, LI Qian-guang, YI Xu-nong etc. Polaron Effects on The Optical Absorption Coefficients in A Cylindrical ZnS/CdSe Core-Shell Quantum Dot[J]. Chinese Journal of Luminescence, 2017,38(5): 580-586 DOI： 10.3788/fgxb20173805.0580.

摘要

在有效质量近似下，利用量子力学密度矩阵理论，从理论上研究了考虑极化子效应后核壳量子点中线性、三阶非线性以及总的光吸收系数在不同条件下随入射光能量变化的关系。通过数值计算，分析了电子-LO声子和电子-IO声子相互作用对ZnS/CdSe柱型核壳结构量子点光吸收系数的影响。结果表明，极化子效应对光吸收系数有很大影响，不同声子模式对光吸收系数影响大小不同。考虑电子-LO声子后，光吸收系数被大大提高。另外，入射光强和弛豫时间对系统的吸收系数也有很大影响。

Abstract

The polaron effects on the linear and nonlinear optical absorption coefficients are investigated theoretically for electrons confined in a core-shell quantum dot. The interactions of electrons with the confined longitudinal optical (LO) and the interface optical (IO) phonon modes in the core-shell system are investigated. An analytic formula for the optical absorption is derived with compact-density-matrix approach and iterative method. The optical absorption coefficients in a ZnS/CdSe core-shell quantum dot (QD) are calculated numerically for different pump photon energies

incident optical intensities and relaxation times. Results show that the optical absorption coefficients are dependent on the photon energy and relaxation time dramatically. Moreover

when the electron-LO phonon interaction is considered

the optical absorption coefficient is enhanced more than 2 times.

关键词

极化子核-壳量子点光吸收

Keywords

polaronscore-shell quantum dotoptical Absorption

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