期刊
ACTA MECHANICA SINICA
卷 33, 期 1, 页码 71-76出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10409-016-0602-2
关键词
Monolayer black phosphorus; Bending to extension; Accordion effect; Density functional theory
资金
- 973 program [2012CB937500, 2013CB932604]
- National Natural Science Foundation of China [51535005, 51472117, 11021262, 11172303, 11132011]
- Fundamental Research Funds for the Central Universities [NP2013309]
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 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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