CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Optimized geometry and electronic structure of graphyne-like silicyne nanoribbons |
Pei Yang (裴洋), Wu Hai-Bin (武海斌) |
State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China |
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Abstract Silicyne, a silicon allotrope, which is closely related to silicene and has the graphyne-like structure, is theoretically investigated in this work. Its optimized geometry and electronic band structure are calculated by means of the first-principles frozen-core projector-augmented wave method implemented in the Vienna ab initio simulation package (VASP). We find that the lattice parameter is 9.5 Å, the silicon chain between hexagons is composed of disilynic linkages (-Si≡Si-) rather than cumulative linkages (=Si=Si=), and the binding energy is -3.41 eV per atom. The band structure is calculated by adopting the generalized gradient approximation and hybrid functionals. The band gap produced by the HSE06 functional is 0.73 eV, which is nearly triple as much as that by the generalized gradient approximation of Perdew-Burke-Ernzerhof functional.
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Received: 27 September 2012
Revised: 24 December 2012
Accepted manuscript online:
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PACS:
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73.22.-f
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(Electronic structure of nanoscale materials and related systems)
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81.07.-b
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(Nanoscale materials and structures: fabrication and characterization)
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Corresponding Authors:
Pei Yang
E-mail: ypei@semi.ac.cn
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Cite this article:
Pei Yang (裴洋), Wu Hai-Bin (武海斌) Optimized geometry and electronic structure of graphyne-like silicyne nanoribbons 2013 Chin. Phys. B 22 057303
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