Effect of structural parameters and applied external fields on the third harmonic generation coefficient of AlGaAs/GaAs three-step quantum wellM. Sayrac, H. Dakhlaoui, W. Belhadj and F. UnganEur. Phys. J. Plus, 139 1 (2024) 57DOI: https://doi.org/10.1140/epjp/s13360-024-04878-w