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Journal of Optics

, Volume 47, Issue 4, pp 445–455 | Cite as

Binding energy and the third-order nonlinear optical susceptibility of an exciton in GaAs/AlGaAs core/shell spherical quantum dot

  • Zhi-Hai Zhang
  • Jun Sheng Li
  • Jian Tang
  • Liang Liang Yang
  • Kang-Xian Guo
  • Jian-Hui Yuan
Research Article
  • 30 Downloads

Abstract

In this study, we have calculated the energy levels and binding energies for exciton associated with the ground state and some low-lying states in GaAs/AlGaAs core/shell spherical quantum dot (QD) by using the finite difference method. The correctness of the numerical results is verified by comparison with the analytical solution without considering exciton effects. Simultaneously, the third harmonic generation (THG) in GaAs/AlGaAs core/shell spherical QD is theoretically investigated within the framework of the compact-density-matrix approach and iterative method for both cases with and without exciton effects. All paths of the system are considered which generates third harmonics. Our results indicate that the energy levels and binding energies are depended dramatically on the size of the QD. The THG is greatly enhanced because of the quantum confinement of exciton. It is over two times bigger than that obtained by without considering exciton effects. In addition, the resonant peaks and its corresponding to resonant energy are also taken into account.

Keywords

Exciton effect Nonlinear optical Quantum dot Binding energy 

Notes

Acknowledgements

Project supported by the National Science Foundation of China (under Grant Nos. 11604289 and 61475039), the Guangxi Department of Education Research Projects in China (under Grant No. KY2015LX046), and the Natural Science Foundation of Guangxi in China (under Grant No. 2016GXNSFBA380017).

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Copyright information

© The Optical Society of India 2018

Authors and Affiliations

  • Zhi-Hai Zhang
    • 1
  • Jun Sheng Li
    • 1
  • Jian Tang
    • 1
  • Liang Liang Yang
    • 1
  • Kang-Xian Guo
    • 2
  • Jian-Hui Yuan
    • 3
  1. 1.School of New Energy and Electronic EngineeringYancheng Teachers UniversityYanchengPeople’s Republic of China
  2. 2.College of Physics and Electronic EngineeringGuangzhou UniversityGuangzhouPeople’s Republic of China
  3. 3.Department of PhysicsGuangxi medical universityNanningPeople’s Republic of China

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