2015/11/05 by Lídia C. Gomes, A. Carvalho, Alexandra Carvalho +1
Materials Science · Mathematics · Physics and Astronomy · #2D Materials and Applications #Composite material #Condensed matter physics #Dielectric #Dielectric permittivity #Diffraction #Lattice (music) #Lattice constant #MXene and MAX Phase Materials #Materials science #Mathematics #Monolayer #Nanotechnology #Optics #Optoelectronics #Organic and Molecular Conductors Research #Permittivity #Physics #Piezoelectricity #Poisson distribution #Poisson's ratio #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.92.214103
arxiv created 2015/11/05 · openalex publication_date 2015/12/08 · arxiv updated 2016/01/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We use first-principles calculations to investigate the lattice properties of group-IV monochalcogenides. These include static dielectric permittivity, elastic and piezoelectric tensors. For the monolayer, it is found that the static permittivity, besides acquiring a dependence on the interlayer distance, is comparatively higher than in the 3D system. In contrast, it is found that elastic properties are little changed by the lower dimensionality. Poisson ratios relating in-plane deformations are close to zero, and the existence of a negative Poisson ratio is also predicted for the GeS compound. Finally, the monolayer shows piezoelectricity, with piezoelectric constants higher than those recently predicted to occur in other 2D systems, such as hexagonal BN and transition-metal dichalcogenide monolayers.