Abstract
Dielectric response of uni-axial and bi-axial mechanically strained silicene with different types of strains at different magnitudes (e ¼0, 0.04, 0.08 and 0.12) is shown in figure. abstract The uni-axial and bi-axial mechanical strain mediated electronic band structures and dielectric proper- ties of silicene have been investigated. It is found that on applying uni- and bi-axial strains, the band gap opens for smaller strain in silicene. However, on further increase of strain beyond 8% silicene changed into metal. The ultimate tensile strength estimated is 3.4 GPa. Imaginary part of dielectric function shows that the inter-band transitions are red-shifted for uni- and bi-axial tensile strains and are blue shifted for uni- and bi-axial compressive strains. Electron energy loss (EEL) function shows that the πþs plasmon energies are red-shifted for uni- and bi-axial strains and blue-shifted for compressive strains. The π plasmons disappears for tensile and asymmetric strains. Bi-axial asymmetric strain is found to have no influence on inter-band transitions and πþs plasmon energies.
Published Version
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