论文标题
范德华异质结构中能量景观的莫伊尔计量
Moiré metrology of energy landscapes in van der Waals heterostructures
论文作者
论文摘要
利用二维材料之间的扭曲角的新兴领域是设计量子材料设计的有前途的途径，因为扭曲角诱导的超级晶格提供了控制拓扑和强相关性的手段。在较小的扭曲极限，尤其是在应变下，随着原子弛豫的占上风，新兴的Moiré超级晶格编码了对局部层间相互作用的难以捉摸的见解。在这里，我们将Moiré计量学作为一个合并的实验理论框架，以探测0.1 MEV/ATOM量表的双层结构的堆叠能量景观，从而优于量子化学的金标准。通过研究Moiré结构域的形状，具有许多纳米成像技术，并与多尺度建模相关，我们评估和完善了层相互作用的第一原则模型。我们记录了三个代表性扭曲系统的Moiré计量学的能力：双层石墨烯，双双层石墨烯和H-stacked $ Mose_2/wse_2 $。 Moiré计量学建立了寻求的实验基准以进行层间相互作用，从而实现了扭曲多层的准确建模。
The emerging field of twistronics, which harnesses the twist angle between two-dimensional materials, represents a promising route for the design of quantum materials, as the twist-angle-induced superlattices offer means to control topology and strong correlations. At the small twist limit, and particularly under strain, as atomic relaxation prevails, the emergent moiré superlattice encodes elusive insights into the local interlayer interaction. Here we introduce moiré metrology as a combined experiment-theory framework to probe the stacking energy landscape of bilayer structures at the 0.1 meV/atom scale, outperforming the gold-standard of quantum chemistry. Through studying the shapes of moiré domains with numerous nano-imaging techniques, and correlating with multi-scale modelling, we assess and refine first-principle models for the interlayer interaction. We document the prowess of moiré metrology for three representative twisted systems: bilayer graphene, double bilayer graphene and H-stacked $MoSe_2/WSe_2$. Moiré metrology establishes sought after experimental benchmarks for interlayer interaction, thus enabling accurate modelling of twisted multilayers.
