Atomistic simulations of structural and thermodynamic properties of bilayer graphene | |
Article | |
关键词: MEMBRANES; FLUCTUATIONS; | |
DOI : 10.1103/PhysRevB.81.235439 | |
来源: SCIE |
【 摘 要 】
We study the structural and thermodynamic properties of bilayer graphene, a prototype two-layer membrane, by means of Monte Carlo simulations based on the empirical bond order potential LCBOPII (long-range carbon bond order potential II). We present the temperature dependence of lattice parameter, bending rigidity, and high-temperature heat capacity as well as the correlation function of out-of-plane atomic displacements. The thermal-expansion coefficient changes sign from negative to positive above approximate to 400 K, which is lower than previously found for single-layer graphene and close to the experimental value of bulk graphite. The bending rigidity is twice larger than for single layer graphene, making the out-of-plane fluctuations smaller. The crossover from correlated to uncorrelated out-of-plane fluctuations of the two carbon planes occurs for wave vectors shorter than approximate to 3 nm(-1).
【 授权许可】
Free