Electric field effect in ultrathin zigzag graphene nanoribbons*
Zhang Wen-Xing†, Liu Yun-Xiao‡, Tian Hua, Xu Jun-Wei, Feng Lin
       
Dependence of band gap on the strength of electric field ( E ) for 3ZGNR (red) and 4ZGNR (blue). The band gap is obtained by the GGA calculation.