A Novel Hyperbolic Two-Dimensional Carbon Materialwith an In-Plane Negative Poisson’s Ratio Behavior and Low-GapSemiconductor Characteristics
2020
Poisson’s
ratio is one of the fundamental features of materials,
reflecting the transverse strain response to the applied certain axial
strain. The materials with a negative Poisson’s ratio, also
known as auxetic materials, are rare in nature and attract lots of
research interest because of their unusual mechanical behavior and
extensive applications in mechanical nanodevices. Here, we proposed
and studied a novel hyperbolic two-dimensional graphene-like structure
(GLS) showing a negative Poisson’s ratio behavior by first-principles
calculation. The thermodynamic, dynamic, lattice dynamic, and mechanical
stabilities of the GLS were carefully studied. In addition, we also
explored the electronic structure, mechanical characteristics, and
optical-electronic characteristics. The GLS not only displays a negative
Poisson’s ratio in certain directions but also shows low-gap
semiconductor characteristics and superior electronic conductivity.
It is a potential sunscreen material because of the outstanding reflection
and absorption for ultraviolet and infrared light.
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