Twisted Bilayer Graphene: Moire with a Twist
Twisted Bilayer Graphene: Moire with a Twist
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DOI：
10.1021/acs.nanolett.6b02870
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发表时间：
2016-09-01
期刊：
影响因子：
10.8
通讯作者：
Srolovitz, David J.
中科院分区：
文献类型：
--
作者：
Dai, Shuyang;Xiang, Yang;Srolovitz, David J.
建立了一个多尺度模型来预测扭曲双层石墨烯（tBLG）的平衡结构。两个不同的，修改后的莫尔结构观察。呼吸模式，稳定在大扭转角，具有小的振幅（相反的两个层的萌芽。弯曲模式的特征在于层的大幅度（相同符号）出芽。后者产生由扭曲位错结构组成的扭曲莫尔图案。莫尔结构的弛豫降低了对称性并增加了tBLG的周期。在此基础上，我们导出了tBLG能量随角度变化的定量分析模型。
A multiscale model is developed to predict the equilibrium structure of twisted bilayer, graphene (tBLG). Two distinct, modified Moire structures are observed. The breathing mode, stable at large twist angle, has small amplitude (opposite budding of the two layers. The bending mode is characterized-by large amplitude (same sign) budding of the layers. The latter gives rise to a, distorted Moire pattern consisting of a twisted dislocation structure., The relaxation of the Moire structure reduces the symmetry and increases: the period of the tBLG. On the basis of these results, we derive a-quantitative analytical model for the angle dependence of the tBLG energy.