Stable Planar Single-Layer Hexagonal Silicene Under Tensile Strain And Its Anomalous Poisson'S Ratio
APPLIED PHYSICS LETTERS(2014)
摘要
Here, we report the structural and mechanical properties of several two-dimensional (2-D) materials by using first-principles density functional theory calculations. We find that the buckled single-layer silicene could transit to planar hexagonal silicene at a critical tensile strain of 0.20. Phonon dispersion analysis suggests that the planar hexagonal silicene under tension is stable. The Poisson's ratio of silicene and MoS2 shows strong anisotropy: it increases while stretched in the zigzag direction, but decreases when strained in the armchair direction. When stretched in the zigzag direction, the Poisson's ratio of silicene could reach 0.62. (C) 2014 AIP Publishing LLC.
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关键词
finite element analysis,biomechanics,ageing,nano indentation
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