Large polaron evidence in the ultrafast THz response of Lead-Halide Perovskites Eugenio Cinquanta, Daniele Meggiolaro, Silvia G. Motti, Marina Gandini, Marcelo Alcocer, Akkerman Quinten A., Caterina Vozzi, Liberato Manna, Annamaria Petrozza, Filippo De Angelis and Salvatore Stagira EPJ Web Conf., 205 (2019) 04019 Published online: 16 April 2019 DOI: 10.1051/epjconf/201920504019