论文标题
在外延二维材料中Moiré晶格的弹性特性
Elastic properties of moiré lattices in epitaxial two-dimensional materials
论文作者
论文摘要
与常规的二维（2D）半导体超晶格不同，2D材料中的Moiré图案是柔性的，其电子，磁性，光学和机械性能取决于它们的地形。在将2D材料视为结晶弹性膜的连续+原子理论中，我们放弃了通常假定的这些材料的平坦膜场景，并解决了平面外变形。我们面对对金属模型系统，外延石墨烯和MOS $ _2 $的实验分析的预测，并揭示存储在膜上的压缩/膨胀和弯曲能可以与粘附能竞争，从而导致细微的Moiré波长选择和皱纹的形成。
Unlike conventional two-dimensional (2D) semiconductor superlattices, moiré patterns in 2D materials are flexible and their electronic, magnetic, optical, and mechanical properties depend on their topography. Within a continuous+atomistic theory treating 2D materials as crystalline elastic membranes, we abandon the flat-membrane scenario usually assumed for these materials and address out-of-plane deformations. We confront our predictions to experimental analyses on model systems, epitaxial graphene, and MoS$_2$ on metals and reveal that compression/expansion and bending energies stored in the membrane can compete with adhesion energy, leading to a subtle moiré wavelength selection and the formation of wrinkles.
