Time and energy dependent dynamics of the STM tip – graphene system P. Vancsó, G.I. Márk, Ph. Lambin, C. Hwang and L.P. Biró Eur. Phys. J. B, 85 4 (2012) 142 Published online: 26 April 2012 DOI: 10.1140/epjb/e2012-20458-y