Exploring nonlinear optical properties of single δ-doped quantum wells: influences of position-dependent mass, temperature, and hydrostatic pressureM. Sayrac, L. Acıkgoz, A. T. Tuzemen, M. E. Mora-Ramos and F. UnganEur. Phys. J. Plus, 140 2 (2025) 122DOI: https://doi.org/10.1140/epjp/s13360-025-06068-8