Bending-induced extension in two-dimensional crystals

Douxing Pan; Yao Li; Tzu-Chiang Wang; Wanlin Guo

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Bending-induced extension in two-dimensional crystals

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We find by ab initio simulations that significant overall tensile strain can be induced by pure bending in a wide range of two-dimensional crystals perpendicular to the bending moment, just like an accordion being bent to open. This bending-induced tensile strain increases in a power law with bent curvature and can be over 20% in monolayered black phosphorus and transition metal dichalcogenides at a moderate curvature of 2 nm?1 but more than an order weaker in graphene and hexagon boron nitride. This accordion effect is found to be a quantum mechanical effect raised by the asymmetric response of chemical bonds and electron density to the bending curvature.

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《力学学报：英文版》 |2017年第001期|71-76|共6页
作者
Douxing Pan; Yao Li; Tzu-Chiang Wang; Wanlin Guo;
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作者单位

State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;

University of Chinese Academy of Sciences,Beijing 100049,China;

State Key Laboratory of Mechanics and Control for Mechanical Structures and Key Laboratory for Intelligent Nano Materials and Devices (MOE),Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;

State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;

State Key Laboratory of Mechanics and Control for Mechanical Structures and Key Laboratory for Intelligent Nano Materials and Devices (MOE),Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;

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Bending-induced extension in two-dimensional crystals

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