Electric field effect on the nonlinear second- and third-harmonic generation of a Rosen–Morse quantum wellXin-Yi Xu, Wan-hua Zhang, Zhi-Yue Song, Si-Rui Ge, Jian-Hui Yuan and Zhi-Hai ZhangEur. Phys. J. Plus, 138 6 (2023) 571DOI: https://doi.org/10.1140/epjp/s13360-023-04203-x