Gordillo M C, Boronat J
Departamento de Sistemas Físicos, Químicos y Naturales, Facultad de Ciencias Experimentales, Universidad Pablo de Olavide, Carretera de Utrera, km 1, 41013 Sevilla, Spain.
Phys Rev Lett. 2009 Feb 27;102(8):085303. doi: 10.1103/PhysRevLett.102.085303.
The phase diagram of the first layer of 4He adsorbed on a single graphene sheet has been calculated by a series of diffusion Monte Carlo calculations including corrugation effects. Since the number of C-He interactions is smaller than in graphite, the binding energy of 4He atoms to graphene is reduced approximately 13.4 K per helium atom. Our results indicate that the phase diagram is qualitatively similar to that of helium on top of graphite. A two-dimensional liquid film on graphene is predicted to be metastable with respect to the commensurate solid but the difference in energy between both phases is very small, opening the possibility of such a liquid film to be experimentally observed.
通过一系列包括波纹效应的扩散蒙特卡罗计算，已得出吸附在单个石墨烯片上的第一层4He的相图。由于C-He相互作用的数量比在石墨中少，4He原子与石墨烯的结合能每个氦原子大约降低13.4K。我们的结果表明，该相图在定性上与石墨上氦的相图相似。预计石墨烯上的二维液膜相对于相称固体是亚稳的，但两相之间的能量差非常小，这使得这种液膜有可能通过实验观察到。
