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The European Physical Journal Plus

Exploring nonlinear optical properties of single δ-doped quantum wells: influences of position-dependent mass, temperature, and hydrostatic pressure

M. Sayrac, L. Acıkgoz, Ahmet Türker Tüzemen, Miguel Eduardo Mora-Ramos, Fatih Ungan

Published Feb 12, 2025• 13 citations
Publisher

Abstract

Abstract This study investigates the multifaceted impact of position-dependent effective mass, temperature, and hydrostatic pressure on the electronic and optical properties of single-doped quantum wells, with a particular emphasis on varying doping levels. Utilizing effective mass and parabolic band approximations, calculations were meticulously conducted via the diagonalization method, employing a trigonometric orthonormal function basis to elucidate the eigenvalues and eigenfunctions of the confined electron potential. The obtained results unveil substantial alterations in electron energies, state transitions, and absorption spectra consequent to fluctuations in doping levels, temperature, and pressure. These findings provide profound insights into the intricate interplay between semiconductor characteristics and external stimuli, laying a foundation for the optimization of laser and optoelectronic devices through the tailored engineering of material properties. This comprehensive understanding not only advances fundamental knowledge in semiconductor physics but also paves the way for the development of innovative materials with customized optical functionalities, thus driving progress in a wide array of technological applications.

DOI
10.1140/epjp/s13360-025-06068-8

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In this paper, we explore the optical properties of AlGaAs/GaAs semi-parabolic quantum well (QW) under different temperature, hydrostatic pressure and applied magnetic field. We calculate the nonlinear optical absorption coefficients and the refractive index changes (RICs) with the compact density-matrix approach and iterative method. Then, within the framework of the effective mass and parabolic-band approximations, the energy eigenvalues and the corresponding wave functions for semi-parabolic QW have been obtained by the finite difference method. The theoretical findings show that (1) the energy spectrum depends strongly on temperature, hydrostatic pressure and applied magnetic field; (2) the linear and third-order nonlinear optical absorption coefficients and the RICs are quite sensitive to temperature, hydrostatic pressure and applied magnetic field. Our study provides a theoretical basis for the fabrication of QW structure.
Optical properties of quantum well nanostructure for typical GaAs/AlxGa1-xAs are investigated in a new approach. By using the point canonical transformation method and numerical solution of the Schrödinger equation, the energy levels and wave functions of electrons in the quantum well confinement potential are calculated. Then, the effect of position-dependent effective mass on the intersubband optical absorption coefficient and the refractive index changes of the quantum well calculated by compact density matrix method, are studied. Results are compared with the case of constant mass. Our results show that with considering spatially varying electron effective mass linear and nonlinear optical properties increases and shifts toward the lower energies. Researches on this matter open a new field in fundamental and applied physics, and also offer a wide range of potential applications for photonic devices.
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In the present paper, the linear and non-linear optical properties of GaAs/AlGaAs multiple quantum well with on-center and on-edge delta doping are studied within the effective mass approximation. The delta potential is analytically modeled within each quantum well potential to obtain the energy levels and the corresponding wave functions using the robust finite difference method. The linear and non-linear optical absorption coefficients and changes in the refractive index are studied in the presence of a static magnetic and a periodic laser field using the density matrix approach. The obtained results show that the position of resonances and the amplitude of the optical absorption coefficients and the refractive index changes can be modified by varying the magnetic field and strength and position of doping potential. Lastly, an increase of the optical intensity appreciably changes the total absorption coefficient, as well as the total refractive index changes. Obtained results are important for the design of various electronic components such as high-power FETs and infrared photonic devices based on the intersubband transition of electrons in δ-doped multiple quantum wells.