论文标题
观察魔法扭曲的三层石墨烯中共存的狄拉克带和莫伊尔的平坦乐队
Observation of Coexisting Dirac Bands and Moiré Flat Bands in Magic-Angle Twisted Trilayer Graphene
论文作者
论文摘要
Moiré超晶格由两层或多层层的二维材料组成，它们与小扭曲角一起出现，作为一个可调平台，以实现各种相关和拓扑阶段，例如Mott Insulators，Mott Insulators，Mott Instogical，非常常规的上下运动和量子异常的Hall效应。最近，魔术角扭曲的三层石墨烯（MATTG）表现出了与魔术角扭曲的双层石墨烯（MATBG）相似的强大超导性，以及其他独特的特性，包括违反Pauli-Limit违反Pauli-Limit和重新输入超导性。这些丰富的特性深深根植在其电子结构下，在不同的Moiré电位和镜面对称性的影响下。在这里，结合了纳米尺度在空间分辨的角度分辨光谱光谱（纳米孔）和扫描隧道显微镜/光谱法（STM/STS）中，我们系统地测量了MattG接近电荷中性的尚未探索的MATT型带结构。我们的测量结果揭示了独特的分散狄拉克带与新兴的Moiré平面带的共存，与理论计算很好地一致。这些结果是进一步理解MATTG中非常规超导性的Steptone。
Moiré superlattices that consist of two or more layers of two-dimensional materials stacked together with a small twist angle have emerged as a tunable platform to realize various correlated and topological phases, such as Mott insulators, unconventional uperconductivity and quantum anomalous Hall effect. Recently, the magic-angle twisted trilayer graphene (MATTG) has shown both robust superconductivity similar to magic-angle twisted bilayer graphene (MATBG) and other unique properties, including the Pauli-limit violating and re-entrant superconductivity. These rich properties are deeply rooted in its electronic structure under the influence of distinct moiré potential and mirror symmetry. Here, combining nanometer-scale spatially resolved angle-resolved photoemission spectroscopy (nano-ARPES) and scanning tunneling microscopy/spectroscopy (STM/STS), we systematically measure the yet unexplored band structure of MATTG near charge neutrality. Our measurements reveal the coexistence of the distinct dispersive Dirac band with the emergent moiré flat band, showing nice agreement with the theoretical calculations. These results serve as a stepstone for further understanding of the unconventional superconductivity in MATTG.
