论文标题
扭曲的双层HBN中的扁平带，应变和电荷分布
Flat bands, strains, and charge distribution in twisted-bilayer hBN
论文作者
论文摘要
我们研究扭曲对双层石墨烯的影响。包括晶格松弛的效果；我们查看电子结构，压电电荷和自发极化。我们表明，没有晶格松弛的电子结构显示了一组类似于Landau级别的极平坦的距离状态，在该状态下，间距具有扭曲角度。随着晶格松弛，我们仍然有平坦的频带，但是现在频谱变得独立于扭曲角度，以获得足够的小角度。我们详细描述了频带的性质，并研究了适当的连续模型，同时解释了频谱，我们发现，即使两者平行的频谱也非常相似，但自发极化效应也仅用于平行对齐。我们认为，这表明硼和氮之间跳动大型层间。
We study the effect of twisting on bilayer graphene. The effect of lattice relaxation is included; we look at the electronic structure, piezo-electric charges and spontaneous polarisation. We show that the electronic structure without lattice relaxation shows a set of extremely flat in-gap states similar to Landau-levels, where the spacing scales with twist angle. With lattice relaxation we still have flat bands, but now the spectrum becomes independent of twist angle for sufficiently small angles. We describe in detail the nature of the bands, and study appropriate continuum models, at the same time explaining the spectrum We find that even though the spectra for both parallel an anti-parallel alignment are very similar, the spontaneous polarisation effects only occur for parallel alignment. We argue that this suggests a large interlayer hopping between boron and nitrogen.
