Superlattice structures of silicene-based armchair nanoribbons by density functional theory calculation

Based on the DFT calculations, the various types of ASiSLs, which are the periodically repeated junctions made of ASiNRs with different widths, have been investigated. The band structures of ASiSLs were modulated by the size and strain of superlattices. The length of the narrow and wide nanoribbons plays interesting roles in the modulation of the electronic structures of ASiSLs. It could alter the band structure, and modify the distribution of the localized and dispersive states of superlattices. With the stain increased, the related energy gaps of ASiSLs will change, which are significantly different with that of the constituent nanoribbons.