arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.08063cond-mat.mes-hallcond-mat.mtrl-sci
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石墨烯中应变诱导莫尔条纹和赝磁场束缚态的产生

Emergence of strain-induced moiré patterns and pseudo-magnetic field confined states in graphene

Md Tareq Mahmud, Nancy Sandler

摘要:

石墨烯中的应变诱导变形改变了电荷分布,并提供了一种新的方法来设计能带结构和输运性质中的特定特征。新的方法实现工程基板,以诱导特异性靶向应变谱。出于这种技术的动机,我们研究了电荷分布的演变与越来越多的面外变形作为一个例子,一个有限大小的周期性基板。我们首先分析了两个重叠变形的系统,并确定了几何参数与局域态密度特征之间的定量关系。我们的研究扩展到3和4变形的线性和二维阵列,并观察到莫尔条纹的出现,更明显的六边形细胞组成的7变形。在不同能量下的诱导应变分布和局部态密度的空间图之间的比较提供了在有界区域中由伪磁场限制的状态的存在的证据,这让人想起量子点结构。由于这些状态的存在,本地探针观察到的能级标度应表现出与伪场的线性相关性,与伪朗道能级的预期标度相反。

英文摘要:

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.

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