First-principles study of ultrafast bandgap dynamics in laser-excited -quartzElena Kachan, Arshak Tsaturyan, Razvan Stoian and Jean-Philippe ColombierEur. Phys. J. Spec. Top., 232 13 (2023) 2241-2245DOI: https://doi.org/10.1140/epjs/s11734-022-00747-8