Polaron Effects on The Optical Absorption Coefficients in A Cylindrical ZnS/CdSe Core-Shell Quantum Dot

CHEN Zhi-hong; LI Qian-guang; YI Xu-nong; YU Hua-qing; XIONG Liang-bin

doi:10.3788/fgxb20173805.0580

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Polaron Effects on The Optical Absorption Coefficients in A Cylindrical ZnS/CdSe Core-Shell Quantum Dot

更新时间：2020-08-12

- Polaron Effects on The Optical Absorption Coefficients in A Cylindrical ZnS/CdSe Core-Shell Quantum Dot
- Chinese Journal of Luminescence Vol. 38, Issue 5, Pages: 580-586(2017)
- 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：
  
  Supported by National Natural Science Foundation of China(11547018);Research Foundation of Education Bureau of Hubei Province(Q20142706);Natural Science Foundation of Hubei Engineering University(z2013028);Natural Science Foundation of Hubei Province(2014CFB579)
- DOI：10.3788/fgxb20173805.0580
  CLC： O472.3;O437
- Received：13 December 2016，
  
  Revised：03 February 2017，
  
  Published：05 May 2017
- 稿件说明：
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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.

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references

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