Ultrafast optical manipulation of atomic motion in multilayer Ge-Sb-Te phase change materials K. Makino, J. Tominaga, A. V. Kolobov, P. Fons and M. Hase EPJ Web of Conferences, 41 (2013) 03007 Published online: 13 March 2013 DOI: 10.1051/epjconf/20134103007