▎ 摘　　要

First-principles simulations were carried out to explore the excited electron dynamics of graphene nanoribbons (GNRs) under femtosecond laser pulses and an electrostatic field. Electron emission was found to be governed by both the electric dipole transition probability and the characters of the excited states, which are dependent on the edge termination of the GNR. For the laser parameters used in the simulations, the emission mechanism was demonstrated to be one-photon photoemission. The present approach enables a physical interpretation of highly nonequilibrium electron emission processes. (C) 2012 The Japan Society of Applied Physics