Tunable Bandgap in Silicene and Germanene Ni, Zeyuan ; Liu, Qihang ; Tang, Kechao ; Zheng, Jiaxin ; Zhou, Jing ; Qin, Rui ; Gao, Zhengxiang ; Yu, Dapeng ; Lu, Jing Abstract Publication: Nano Letters Pub Date: January 2012 DOI: 10.1021/nl203065e Bibcode: 2012NanoL..12..113N