论文标题
扭曲的石墨烯摩尔超级晶格中的非常规非局部弛豫动力学
Unconventional Nonlocal Relaxation Dynamics in a Twisted Graphene Moire Superlattice
论文作者
论文摘要
可以通过与层间扭曲组装原子薄材料的电子和结构性能。在此过程中，组成层自发地重新排列自身以寻找最低的能量配置。这种放松现象会导致意外的新型材料特性。在这里，我们使用纳米光谱和隧道光谱工具研究了扭曲的双三层石墨烯（TDTG）。我们揭示了令人惊讶的光学和电子对比，以及莫伊尔域之间出现的堆叠能量不平衡。我们将这种形式归因于晶格松弛的一种非常规形式，在制造过程中，整个石墨烯层自发移动位置。我们分析了这种过渡的能量学，并证明了这是非本地弛豫过程的结果，在该过程中，摩尔晶格的一个域中的能量增益是通过在另一方发生的放松来支付的。
The electronic and structural properties of atomically thin materials can be controllably tuned by assembling them with an interlayer twist. During this process, constituent layers spontaneously rearrange themselves in search of a lowest energy configuration. Such relaxation phenomena can lead to unexpected and novel material properties. Here, we study twisted double trilayer graphene (TDTG) using nano-optical and tunneling spectroscopy tools. We reveal a surprising optical and electronic contrast, as well as a stacking energy imbalance emerging between the moiré domains. We attribute this contrast to an unconventional form of lattice relaxation in which an entire graphene layer spontaneously shifts position during fabrication. We analyze the energetics of this transition and demonstrate that it is the result of a non-local relaxation process, in which an energy gain in one domain of the moire lattice is paid for by a relaxation that occurs in the other.
