Band gap modulation effect on electronic and optical properties in PbTiO3 under stress: a DFT studyMuhammad Rizwan, Rabia Bibi, Tariq Mahmood, Imran Aslam, Syed Sajid Ali Gillani, Hai Boa Jin, Chuan Bao Cao, Zahid Usman and Ahmad MaqsoodEur. Phys. J. Appl. Phys., 88 1 (2019) 10501DOI: https://doi.org/10.1051/epjap/2019190178