期刊
PHYSICS OF THE SOLID STATE
卷 53, 期 3, 页码 665-668出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1063783411030073
关键词
-
资金
- Presidium of the Russian Academy of Sciences
- Ministry of Education and Science of the Russian Federation within the Analytic Department [2.1.1/2503]
- Russian Foundation for Basic Research [07-020063a]
In the framework of the Keating model with allowance made for the anharmonic constant of the central interaction between the nearest neighbors mu, analytical expressions have been obtained for three third-order independent elastic constants c (ijk) (mu, zeta) of single-layer graphene, where zeta = (2 alpha - beta)/(4 alpha + beta) is the Kleinman internal displacement parameter and alpha and beta are the harmonic constants of the central interaction between the nearest neighbors and the noncentral interaction between the next-nearest neighbors, respectively. The dependences of the second-order elastic constants on the pressure p have been determined. It has been shown that the moduli c (11) and c (22) differently respond to the pressure. Therefore, graphene is isotropic in the harmonic approximation, whereas the inclusion of anharmonicity leads to the appearance of the anisotropy.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据