▎ 摘　　要

We propose a model which describes side-band electron emission from vertically aligned monolayer graphene with an internal time-oscillating barrier and a static edge barrier. Our results show that electron emission is governed by the over-barrier emission process, which is dominated by the time-oscillating barrier. The emitted current line density J [nA/nm] is only dependent on the amplitude V-1 and on the frequency omega of the time-oscillating barrier, and is characterized by 0 < gamma = V-1/<(h)over bar>omega < 1. From the model, it is found that J is maximized at about omega = 10(14) rad/s 10(15) rad/s, and that J increases with gamma. (C) 2013 Elsevier Ltd. All rights reserved.