Results in Physics (Aug 2024)
Effects of hills, morphology, electromagnetic fields, temperature, pressure, and aluminum concentration on the second harmonic generation of GaAs/AlxGa1-xAs elliptical quantum rings
Abstract
In this work, we have theoretically investigated the second harmonic generation (SHG) coefficient in GaAs/AlxGa1-xAs elliptical quantum ring (QR), taking into account the effects of hills, inner radius, electromagnetic fields, temperature, pressure and aluminum concentration. Thus, our study was performed through the resolution of the three-dimensional Schrödinger (3D) equation using the finite difference method (FDM) and the effective mass approximation. The computation of the SHG in such nanostructure was carried out using the compact density matrix formalism. The outcomes reveal that the SHG behaves differently and without monotonicity depending on the number of hills considered in the QR and the electron wave function states are disturbed too with several transformations. It is shown that the QR inner radius affects the SHG and should be perceived precisely. Moreover, the SHG undergoes a linear stark effect in conformity to the applied electric field, which makes this second-order coefficient shift to high or low energies according to the intensity and orientation of the electric field (F). Also, it is found that the SHG shifts slightly to higher (blueshift) or lower (redshift) energies with a decrease or an increase in its peak intensity. Furthermore, as the temperature (T) increases the SHG experiences a blue shift with a raising of the magnitude, nevertheless, the inverse effect is achieved by the increment of the hydrostatic pressure (P). Also, it is found that the SHG is proportional to the magnetic field intensity and decreases with an enhancement in the peak values when the aluminum concentration decreases. Hence, the SHG of the QRs can be tuned and adjusted by varying different factors as mentioned above for various applications in optoelectronic and electronic fields.
