Portal de Periódicos da CAPES

Twisted Bilayer Graphene: Moiré with a Twist

2016; American Chemical Society; Volume: 16; Issue: 9 Linguagem: Inglês

10.1021/acs.nanolett.6b02870

1530-6992

Shuyang Dai, Yang Xiang, David J. Srolovitz,

Plasmonic and Surface Plasmon Research

A multiscale model is developed to predict the equilibrium structure of twisted bilayer graphene (tBLG). Two distinct, modified Moiré structures are observed. The breathing mode, stable at large twist angle, has small amplitude (opposite sign) buckling of the two layers. The bending mode is characterized by large amplitude (same sign) buckling of the layers. The latter gives rise to a distorted Moiré pattern consisting of a twisted dislocation structure. The relaxation of the Moiré 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.