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This study theoretically investigates the linear, third-order nonlinear, and total optical absorption coefficients (ACs) in a GaAs/GaAlAs multilayer quantum dot (MQD). Using the Effective Mass Approximation (EMA) and modeling the confinement potential with a Kratzer potential, we determined the ground and excited state eigenvalues and wave functions by solving the Schrödinger equation via the finite element method (FEM). We analyzed the ACs for \(1p-2s\) and \(2s-2p\) transitions as a function of excitation photon energy. Our results demonstrate that the Kratzer confinement potential significantly impacts both the optical ACs and transition energy. Specifically, we found that the ACs and transition energy are highly sensitive to variations in the Kratzer potential’s depth and the core radius. Furthermore, the optical ACs versus photon energy strongly depend on the initial subband state of the excited electron. These findings are expected to stimulate further experimental research, offering crucial insights for developing multilayer quantum dot-based device applications.

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Kratzer Potential’s Impact on Optical Absorption in Multilayer Quantum Dots

  • 章节

  • 发表日期：

    2026年

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  • A. Fakkahi,
  • H. Azmi,
  • M. Jaouane,
  • A. Sali,
  • A. Ed-Dahmouny,
  • K. El-Bakkari,
  • R. Arraoui,
  • S. Elotmani

摘要

This study theoretically investigates the linear, third-order nonlinear, and total optical absorption coefficients (ACs) in a GaAs/GaAlAs multilayer quantum dot (MQD). Using the Effective Mass Approximation (EMA) and modeling the confinement potential with a Kratzer potential, we determined the ground and excited state eigenvalues and wave functions by solving the Schrödinger equation via the finite element method (FEM). We analyzed the ACs for \(1p-2s\) and \(2s-2p\) transitions as a function of excitation photon energy. Our results demonstrate that the Kratzer confinement potential significantly impacts both the optical ACs and transition energy. Specifically, we found that the ACs and transition energy are highly sensitive to variations in the Kratzer potential’s depth and the core radius. Furthermore, the optical ACs versus photon energy strongly depend on the initial subband state of the excited electron. These findings are expected to stimulate further experimental research, offering crucial insights for developing multilayer quantum dot-based device applications.