Local spectroscopy of moiré-induced electronic structure in gate-tunable twisted bilayer graphene

作     者：Dillon Wong (黃家和) Yang Wang (汪洋) Jeil Jung (정재일) Sergio Pezzini Ashley M. DaSilva Hsin-Zon Tsai Han Sae Jung Ramin Khajeh Youngkyou Kim (김영규) Juwon Lee (이주원) Salman Kahn (成吉思汗) Sajjad Tollabimazraehno Haider Rasool Kenji Watanabe Takashi Taniguchi Alex Zettl Shaffique Adam Allan H. MacDonald Michael F. Crommie 

作者机构：Department of Physics University of California at Berkeley Berkeley California 94720 USA Materials Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics University of Seoul Seoul 130-743 Korea Department of Physics University of Texas at Austin Austin Texas 78712 USA Physics Department National University of Singapore 117551 Singapore Dipartimento di Fisica Università degli studi di Pavia I-27100 Pavia Italy Department of Chemistry University of California at Berkeley Berkeley California 94720 USA Department of Chemical and Biomolecular Engineering University of California at Berkeley Berkeley California 94720 USA Johannes Kepler University Linz 4040 Linz Austria National Institute for Materials Science Tsukuba Ibaraki 305-0044 Japan Yale-NUS College 138614 Singapore 

出 版 物：《Physical Review B》 (物理学评论B辑：凝聚态物质与材料物理学)

年 卷 期：2015年第92卷第15期

页      面：155409-155409页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Japan Society for the Promotion of Science, JSPS, (26248061) Japan Society for the Promotion of Science, JSPS National Science Foundation, NSF, (1206512) National Science Foundation, NSF 

主　　题：ELECTRONIC structure GATE array circuits BILAYERS (Solid state physics) GRAPHENE QUASICRYSTALS SCANNING tunneling microscopy BORON nitride SPECTRUM analysis 

摘      要：Twisted bilayer graphene (tBLG) forms a quasicrystal whose structural and electronic properties depend on the angle of rotation between its layers. Here, we present a scanning tunneling microscopy study of gate-tunable tBLG devices supported by atomically smooth and chemically inert hexagonal boron nitride (BN). The high quality of these tBLG devices allows identification of coexisting moiré patterns and moiré super-superlattices produced by graphene-graphene and graphene-BN interlayer interactions. Furthermore, we examine additional tBLG spectroscopic features in the local density of states beyond the first van Hove singularity. Our experimental data are explained by a theory of moiré bands that incorporates ab initio calculations and confirms the strongly nonperturbative character of tBLG interlayer coupling in the small twist-angle regime.