▎ 摘　　要

In this paper, we investigate the propagation of a light pulse reflection from the layer system with a graphene layer. We show a tunable transition between positive and negative group delays of optical pulse reflection in such a layered system controlled by the properties of the graphene layer and reveal two mechanisms to control the propagation properties of the light pulse reflected from such systems. It is demonstrated that the reflected group delays are tunable from positive to negative values in both mechanisms of resonances and the excitations of surface plasmon resonances, which are also adjusted by tuning the Fermi energy and temperature of the graphene layer. Our results are helpful to control the pulse propagations and are useful for design of graphene-based optical devices. Published by AIP Publishing.