论文标题
石墨烯/H-BN异质结构中均依赖于平等的Moiré超级晶格：通往机械材料的途径
Parity-Dependent Moiré Superlattices in Graphene/h-BN Heterostructures: A Route to Mechanomutable Metamaterials
论文作者
论文摘要
发现交替的石墨烯/H-BN几层异质结构的超级晶格表现出对堆栈中层数量的均衡性的强烈依赖。奇数系统显示出独特的火烈鸟样图案，而它们的偶数对应物具有常规的六边形或矩形超级晶格。当交替的堆栈由七层或更多层组成时，无论奇偶差如何，火烈鸟模式变得有利。值得注意的是，系统的平面瓦楞纸极大地取决于上层建筑的形状，从而产生了其机械性能的显着奇偶校验依赖性。预测的现象起源于在连续层的界面上发展的Moiré模式之间的复杂竞争。这种机制具有一般性质，预计将发生在其他匹配的刚性分层材料的交替堆栈中，如扭曲的石墨烯和H-BN的均匀交替连接所证明。因此，我们的发现允许基于范德华异质结构的机械型超材料的合理设计。
The superlattice of alternating graphene/h-BN few-layered heterostructures is found to exhibit strong dependence on the parity of the number of layers within the stack. Odd-parity systems show a unique flamingo-like pattern, whereas their even-parity counterparts exhibit regular hexagonal or rectangular superlattices. When the alternating stack consists of seven layers or more, the flamingo pattern becomes favorable, regardless of parity. Notably, the out-of-plane corrugation of the system strongly depends on the shape of the superstructure resulting in significant parity dependence of its mechanical properties. The predicted phenomenon originates in an intricate competition between moiré patterns developing at the interface of consecutive layers. This mechanism is of general nature and is expected to occur in other alternating stacks of closely matched rigid layered materials as demonstrated for homogeneous alternating junctions of twisted graphene and h-BN. Our findings thus allow for the rational design of mechanomutable metamaterials based on Van der Waals heterostructures.
