论文标题
晶格松弛，镜像对称性和磁场对扭曲的三层石墨烯中Ultraflat带的影响
Lattice relaxation, mirror symmetry and magnetic field effects on ultraflat bands in twisted trilayer graphene
论文作者
论文摘要
扭曲的石墨烯多层由于在电荷中性点附近存在超纤毛带，表现出密切相关的绝缘状态和超导性。在本文中，通过使用完整的紧密结合模型研究了Ultraflat条带对晶格松弛和具有不同堆叠布置的磁场的响应。我们表明，在存在镜子对称性的情况下，晶格松弛是必不可少的，对于理解TTLG的电子特性，尤其是TTLG的电子特性。晶格松弛使费米能量附近的准粒子光谱重新归一致，并改变了较高能量平坦带的定位。此外，与扭曲的双层石墨烯不同，可以在实验室可访问的磁场强度下实现Hofstadter蝴蝶谱。我们的工作验证了TTLG作为一个更可调的平台，比扭曲的双层石墨烯在密切相关的现象中。
Twisted graphene multilayers exhibit strongly correlated insulating states and superconductivity due to the presence of ultraflat bands near the charge neutral point. In this paper, the response of ultraflat bands to lattice relaxation and a magnetic field in twisted trilayer graphene (tTLG) with different stacking arrangements is investigated by using a full tight-binding model. We show that lattice relaxations are indispensable for understanding the electronic properties of tTLG, in particular, of tTLG in the presence of mirror symmetry. Lattice relaxations renormalize the quasiparticle spectrum near the Fermi energy and change the localization of higher energy flat bands. Furthermore, different from the twisted bilayer graphene, the Hofstadter butterfly spectrum can be realized at laboratory accessible strengths of magnetic field. Our work verifies tTLG as a more tunable platform than the twisted bilayer graphene in strongly correlated phenomena.
