论文标题
在扭曲双层石墨烯的结构过渡状态中重建和未结构结构的共存
Coexistence of Reconstructed and Unreconstructed Structures in Structural Transition Regime of Twisted Bilayer Graphene
论文作者
论文摘要
在扭曲的双层石墨烯（TBG）中，在层间堆叠能量与内层弹性能之间的扭曲依赖性竞争会导致固定的刚性层以大扭曲角度和小扭曲角度的晶格重建。尽管在TBG中进行了巨大的科学兴趣和努力，但仍缺少对从刚性晶格到重建的晶格的演变的实验研究。在这里，我们提出了一项扫描隧道显微镜和光谱研究，以揭示TBG中依赖于角角的晶格重建。我们的实验表明，刚性制度与放松的制度之间存在过渡方案，并且出乎意料地，在过渡方案中共存的重建和未结构的结构。在这种状态下，这两个不同结构的共存可能是由于层间堆叠能量与中间Moiré尺寸的TBG中的层间弹性能量之间的微妙平衡。
In twisted bilayer graphene (TBG), a twist-angle-dependent competition between interlayer stacking energy and intralayer elastic energy results in flat rigid layers at large twist angles and lattice reconstruction at small twist angles. Despite enormous scientific interest and effort in the TBG, however, an experimental study of evolution from the rigid lattice to the reconstructed lattice as a function of twist angle is still missing. Here we present a scanning tunneling microscopy and spectroscopy study to reveal the twist-angle-dependent lattice reconstruction in the TBG. Our experiment demonstrates that there is a transition regime between the rigid regime and the relaxed regime and, unexpectedly, the reconstructed and unreconstructed structures coexist in the transition regime. The coexistence of the two distinct structures in this regime may arise from subtle balance between the interlayer stacking energy and intralayer elastic energy in the TBG with intermediate moiré sizes.
