title: Xiang et al. reply.
authors.affiliation: Key Laboratory of Computational Physical Sciences (Ministry of Education), State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China and National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
authors.forename: H J
authors.initials: HJ
authors.lastname: Xiang
authors.affiliation: National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
authors.forename: Bing
authors.initials: B
authors.lastname: Huang
authors.affiliation: Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, People's Republic of China.
authors.forename: Erjun
authors.initials: E
authors.lastname: Kan
authors.affiliation: National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
authors.forename: Su-Huai
authors.initials: SH
authors.lastname: Wei
authors.affiliation: Key Laboratory of Computational Physical Sciences (Ministry of Education), State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China.
authors.forename: X G
authors.initials: XG
authors.lastname: Gong
mesh_terms: D012825:Silicon / Q000737:chemistry*
chemical_list: D012825:Silicon