Ultrafast exciton dynamics reconstruction with a ptychographic approach Gian Luca Dolso, Bruno Moio, Giacomo Inzani, Nicola Di Palo, Rocío Borrego-Varillas, Mauro Nisoli and Matteo Lucchini EPJ Web Conf., 255 (2021) 13005 Published online: 18 November 2021 DOI: 10.1051/epjconf/202125513005