The electronic properties of van der Waals (vdW) structures can be substantially modified by the moire superlattice potential, which strongly depends on the twist angle among the compounds. In twisted bilayer graphene (TBG), two low-energy Van Hove singularities (VHSs) move closer with decreasing twist angles and finally become highly non-dispersive flat bands at the magic angle (~ 1.1 degree). When the Fermi level lies within the flat bands of the TBG near the magic angle, Coulomb interaction is supposed to exceed the kinetic energy of the electrons, which can drive the system into various strongly correlated phases. Moreover, the strongly correlated states of flat bands are also realized in other graphene-based vdW structures with an interlayer twist. In this article, we mainly review the recent experimental advances on the strongly correlated physics of the magic-angle TBG (MATBG) and the small-angle twisted multilayer graphene. Lastly we will give out a perspective of this field.

中文翻译：

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基于石墨烯的范德华结构中的扭曲电子学

范德华 (vdW) 结构的电子特性可以通过莫尔超晶格势进行显着改变，这在很大程度上取决于化合物之间的扭曲角。在扭曲双层石墨烯 (TBG) 中，两个低能量范霍夫奇点 (VHS) 随着扭曲角的减小而靠近，最终在魔角（~1.1 度）处成为高度非色散的平带。当费米能级位于魔角附近的 TBG 平带内时，库仑相互作用应该超过电子的动能，这可以驱动系统进入各种强相关相。此外，在其他具有层间扭曲的基于石墨烯的 vdW 结构中也实现了平带的强相关状态。在本文中，我们主要回顾了最近在魔角TBG（MATBG）和小角度扭曲多层石墨烯的强相关物理方面的实验进展。最后，我们将给出这个领域的观点。