Superlattice structures of silicene-based armchair nanoribbons by density functional theory calculation Yanning Wu, Kaiyin Zhang, Yinsheng Huang, Shan Wu, Hui Zhu, Ping Cheng and Jun Ni Eur. Phys. J. B, 87 4 (2014) 94 Published online: 16 April 2014 DOI: 10.1140/epjb/e2014-41075-8