论文标题
应变诱导的Moiré模式和伪磁场的出现限制了石墨烯中的状态
Emergence of strain-induced moiré patterns and pseudo-magnetic field confined states in graphene
论文作者
论文摘要
石墨烯中的应变诱导变形改变电荷分布，并为设计带结构和传输属性的特定特征提供了一种新方法。新型方法实施工程底物以诱导特异性靶向应变谱。在这项技术的启发下，我们研究了电荷分布的演变，以越来越多的平面外变形作为有限尺寸的周期性底物的一个例子。我们首先分析了两个重叠变形的系统，并确定状态局部密度的几何参数和特征之间的定量关系。我们将研究扩展到线性和二维阵列中的3和4个变形集，并观察到由7个变形组成的六边形细胞更为明显的Moiré模式的出现。在不同能量处的局部状态密度的诱导应变谱和空间图之间的比较为有界区域中伪磁场限制的状态的存在提供了证据，使人联想到量子点结构。由于这些状态的存在，与伪landau水平的预期缩放相比，局部探针要观察到的能级缩放应与伪场表现出线性依赖性。
Strain-inducing deformations in graphene alter charge distributions and provide a new method to design specific features in the band structure and transport properties. Novel approaches implement engineered substrates to induce specifically targeted strain profiles. Motivated by this technique, we study the evolution of charge distributions with an increasing number of out-of-plane deformations as an example of a finite size periodic substrate. We first analyze a system of two overlapping deformations and determine the quantitative relation between geometrical parameters and features in the local density of states. We extend the study to sets of 3 and 4 deformations in linear and two-dimensional arrays and observe the emergence of moiré patterns that are more pronounced for a hexagonal cell composed of 7 deformations. A comparison between the induced strain profile and spatial maps of the local density of states at different energies provides evidence for the existence of states confined by the pseudo-magnetic field in bounded regions, reminiscent of quantum dots structures. Due to the presence of these states, the energy level scaling to be observed by local probes should exhibit a linear dependence with the pseudo-field, in contrast to the expected scaling of pseudo-Landau levels.
