Effects of heterostrain and lattice relaxation on the optical conductivity of twisted bilayer graphene
Effects of heterostrain and lattice relaxation on the optical conductivity of twisted bilayer graphene
复制标题
异质应变和晶格弛豫对扭曲双层石墨烯光电导率的影响
DOI：
10.1103/physrevb.104.045403
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发表时间：
2021-01
影响因子：
3.7
通讯作者：
Li Zhiqiang
中科院分区：
文献类型：
--
作者：
Dai Zhen-Bing;He Yan;Li Zhiqiang
基于连续介质模型得到的能带结构，从理论上研究了在魔角附近，异质应变和晶格弛豫对扭曲双层石墨烯光学电导率的影响.我们发现，异质应变，晶格弛豫和它们的组合引起非常独特的光谱特征的光学电导率，它可以用来探测和区分这些效果。从不同费米能级的光谱中，可以直接测量应变和弛豫修正能带结构的重要特征，如带隙、带宽和货车霍韦奇异性。与光学电导率中的平带之间的过渡相关联的峰对应变的方向高度敏感，这可以提供关于应变修改的平带的直接信息。
We present a theoretical study of the effects of heterostrain and lattice relaxation on the optical conductivity of twisted bilayer graphene near the magic angle, based on the band structures obtained from a continuum model. We find that heterostrain, lattice relaxation and their combination give rise to very distinctive spectroscopic features in the optical conductivity, which can be used to probe and distinguish these effects. From the spectrum at various Fermi energies, important features in the strainand relaxation-modified band structure such as the bandgap, bandwidth and van Hove singularities can be directly measured. The peak associated with the transition between the flat bands in the optical conductivity are highly sensitive to the direction of the strain, which can provide direct information on the strain-modified flat bands.
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