Heterostrain Determines Flat Bands in Magic-Angle Twisted Graphene Layers,Physical Review Letters

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Heterostrain Determines Flat Bands in Magic-Angle Twisted Graphene Layers
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-09-17 , DOI: 10.1103/physrevlett.127.126405
Florie Mesple ₁ , Ahmed Missaoui ₂ , Tommaso Cea _{3,

4} , Loic Huder ₅ , Francisco Guinea _{3,

6} , Guy Trambly de Laissardière ₂ , Claude Chapelier ₁ , Vincent T Renard ₁

Affiliation

The moiré of twisted graphene bilayers can generate flat bands in which charge carriers do not possess enough kinetic energy to escape Coulomb interactions with each other, leading to the formation of novel strongly correlated electronic states. This exceptionally rich physics relies on the precise arrangement between the layers. Here, we survey published scanning tunneling microscope measurements to prove that near the magic-angle, native heterostrain, the relative deformations between the layers, dominates twist in determining the flat bands as opposed to the common belief. This is demonstrated at full filling where electronic correlations have a weak effect and where we also show that tip-induced strain can have a strong influence. In the opposite situation of zero doping, we find that electronic correlation further renormalizes the flat bands in a way that strongly depends on experimental details.

中文翻译：

异质应变决定了魔角扭曲石墨烯层中的平带

扭曲石墨烯双层的云纹可以产生平坦的带，其中电荷载流子没有足够的动能来逃避库仑相互作用，导致形成新的强相关电子态。这种异常丰富的物理依赖于层之间的精确排列。在这里，我们调查了已发表的扫描隧道显微镜测量结果，以证明在魔角附近，天然异应变，层之间的相对变形，在确定平带时支配扭曲，而不是普遍的看法。这在完全填充时得到证明，其中电子相关性的影响很弱，我们还表明尖端引起的应变可以产生很大的影响。在零掺杂的相反情况下，

更新日期：2021-09-17

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