The optoelectronic properties of boron nitride nanotubes of armchair (7, 7) and zigzag (12, 0) types: A theoretical studyOumaima El Ouardi, Mourad Boutahir, Brahim Fakrach and Hassan ChadliE3S Web Conf., 601 (2025) 00081DOI: https://doi.org/10.1051/e3sconf/202560100081