Ultrafast photo-induced dynamics across the metal-insulator transition of VO2 Siming Wang, Juan Gabriel Ramírez, Jonathan Jeffet, Shimshon Bar-Ad, Dan Huppert and Ivan K. Schuller EPL, 118 2 (2017) 27005 Published online: 22 June 2017 DOI: 10.1209/0295-5075/118/27005