Position-Dependent Effective Mass and Asymmetry Effects on the Electronic and Optical Properties of Quantum Wells with Improved Rosen–Morse Potential
Abstract
In this study, we investigated, for the first time, the effects of the spatially varying effective
mass, asymmetry parameter, and well width on the electronic and optical properties of a quantum
well which has an improved Rosen–Morse potential. Calculations were made within the framework
of the effective mass and parabolic band approximations. We have used the diagonalization method
by choosing a wave function based on the trigonometric orthonormal functions to find eigenvalues
and eigenfunctions of the electron confined within the improved Rosen–Morse potential. Our results
show that the position dependence mass, asymmetry, and confinement parameters cause significant
changes in the electronic and optical properties of the structure we focus on since these effects create
a significant increase in electron energies and a blue shift in the absorption spectrum. The increase in
energy levels enables the development of optoelectronic devices that can operate at wider wavelengths
and absorb higher-energy photons. Through an appropriate choice of parameters, the Rosen–Morse
potential offers, among many advantages, the possibility of simulating heterostructures close to
surfaces exposed to air or vacuum, thus giving the possibility of substantially enriching the allowed
optical transitions given the breaking of the system´s symmetries. Similarly, the one-dimensional
Rosen–Morse potential model proposed here can be extended to one- and zero-dimensional structures
such as core/shell quantum well wires and quantum dots. This offers potential advancements in
fields such as optical communication, imaging technology, and solar cells.