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H_2 on corrugated graphene: Diffusion Monte Carlo calculations

机译:波纹石墨烯上的H_2:扩散Monte Carlo计算

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摘要

The phase diagram of para-H_2 on both one-layer and bilayer graphene was calculated by means of the diffusion Monte Carlo method. The zero-point energy of the carbon atoms in the substrate was taken into account. That inclusion had minor effects on the liquidlike or incommensurate branches of the phase diagram, but it raised appreciably the energy per hydrogen molecule of the 3~(1/2)×3~(1/2) commensurate solid with respect to the case of a perfectly flat substrate. That meant that the ground state of para-H_2 on bilayer graphene was a 3~(1/2)×3~(1/2) registered structure, but on a single graphene layer, both this arrangement and a triangular incommensurate phase of density 0.077 ± 0.001 A~(-2) were found to be in equilibrium at T = 0 K.
机译:通过扩散蒙特卡罗方法计算了在单层和双层石墨烯上对-H_2的相图。考虑了衬底中碳原子的零点能量。该夹杂物对相图的液体状或不相称分支具有较小的影响,但相对于3〜(1/2)×3〜(1/2)相称固体,每个氢分子的能量显着提高。完美平坦的基材。这意味着双层石墨烯上对位H_2的基态为3〜(1/2)×3〜(1/2)配准结构,但在单层石墨烯层上,这种排列方式和密度的三角形不相称相在T = 0 K时,发现0.077±0.001 A〜(-2)处于平衡状态。

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  • 来源
    《Physical review》 |2013年第4期|041406.1-041406.4|共4页
  • 作者

    M. C. Gordillo;

  • 作者单位

    Departamento de Sistemas Fisicos, Quimicos y Naturales, Facultad de Ciencias Experimentales,Universidad Pablo de Olavide. Carretera de Utrera, km 1, 41013 Sevilla, Spain;

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