Ultrafast dynamics of electron-phonon coupling in a metal Choongyu Hwang, Wentao Zhang, Koshi Kurashima, Robert Kaindl, Tadashi Adachi, Yoji Koike and Alessandra Lanzara EPL, 126 5 (2019) 57001 Published online: 27 June 2019 DOI: 10.1209/0295-5075/126/57001