Coherent phonons in Bi2Se3 induced by a powerful THz pulse Alexey Melnikov, Kirill Boldyrev, Yuri Selivanov, Victor Martovitskii, Sergey Chekalin and Evgeni Ryabov EPJ Web Conf., 161 (2017) 01009 Published online: 31 October 2017 DOI: 10.1051/epjconf/201716101009