The recent discovery of superconductivity and magnetism in trilayer rhombohedral graphene (RG) establishes an ideal, untwisted platform to study strong correlation electronic phenomena. However, the correlated effects in multilayer RG have received limited attention, and, particularly, the evolution of the correlations with increasing layer number remains an unresolved question. Here, we show the observation of layer-dependent electronic structures and correlations, under surprising liquid nitrogen temperature, in RG multilayers from 3 to 9 layers by using scanning tunneling microscopy and spectroscopy. We explicitly determine layer-enhanced low-energy flat bands and interlayer coupling strengths. The former directly demonstrates the further flattening of low-energy bands in thicker RG, and the latter indicates the presence of varying interlayer interactions in RG multilayers. Moreover, we find significant splittings of the flat bands, ranging from ~50-80 meV, at 77 K when they are partially filled, indicating the emergence of interaction-induced strongly correlated states. Particularly, the strength of the correlated states is notably enhanced in thicker RG and reaches its maximum in the six-layer, validating directly theoretical predictions and establishing abundant new candidates for strongly correlated systems. Our results provide valuable insights into the layer dependence of the electronic properties in RG and demonstrate it as a suitable system for investigating robust and highly accessible correlated phases.
Anomalous Hall Crystals in Rhombohedral Multilayer Graphene II: General Mechanism and a Minimal Model
Harvard University（哈佛大学）；University of California, Berkeley（加州大学伯克利分校）；Lawrence Berkeley National Laboratory（劳伦斯伯克利国家实验室）；University of California, Santa Barbara（加州大学圣塔芭芭拉分校）；University of California at San Diego（加州大学圣迭戈分校）
Layer-Number-Controlled Symmetry Breaking and Surface-State Transport in Rhombohedral Graphene Multilayers
State Key Laboratory of Micro-nano Engineering Science, Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院）；Department of Quantum Matter Physics, University of Geneva（日内瓦大学量子物质物理系）；Department of Physics, University of Seoul（首尔大学物理系）；Research Center for Electronic and Optical Materials, National Institute for Materials Science（国家材料科学研究所电子光学材料研究中心）；Research Center for Materials Nanoarchitectonics, National Institute for Materials Science（国家材料科学研究所材料纳米架构研究中心）；Department of Smart Cities, University of Seoul（首尔大学智慧城市系）
Superconductivity and Ferroelectric Orbital Magnetism in Semimetallic Rhombohedral Hexalayer Graphene
Cornell University（康奈尔大学）；National Institute for Materials Science（物质材料研究机构）；School of Applied and Engineering Physics, Cornell University（康奈尔大学应用与工程物理学院）；Max Planck Institute for the Structure and Dynamics of Matter（马普物质结构与动力学研究所）
Charge imprinting biases topology of correlated insulator in hBN-aligned rhombohedral multilayer graphene
University of Chinese Academy of Sciences（中国科学院大学）；Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences（中国科学院理论科学 kavli 研究所）；ShanghaiTech University（上海科技大学）；Liaoning Academy of Materials（辽宁省材料研究院）
Entangled Moire Chern Insulator in Rhombohedral Graphene
Peking University（北京大学）；National Institute of Material Sciences（国立材料研究所）；Collaborative Innovation Center of Quantum Matter（量子物质协同创新中心）；Hefei National Laboratory（合肥国家实验室）
Magnetic-field-induced superconductivity in hexalayer rhombohedral graphene
Laboratory of Atomic and Solid State Physics, Cornell University（康奈尔大学原子与固体物理实验室）；National Institute for Materials Science（国立材料研究所）；School of Applied and Engineering Physics, Cornell University（康奈尔大学应用工程物理学院）；Max Planck Institute for the Structure and Dynamics of Matter（马普物质结构与动力学研究所）
Anomalous Hall Crystals in Rhombohedral Multilayer Graphene I: Interaction-Driven Chern Bands and Fractional Quantum Hall States at Zero Magnetic Field
Fermi lune and non-reciprocal transport in rhombohedral multilayer graphene
ShanghaiTech University（上海科技大学）；Nanjing University（南京大学）；Southern University of Science and Technology（南方科技大学）；National Institute for Materials Science（物质材料研究机构）；Fudan University（复旦大学）；Peking University（北京大学）；Liaoning Academy of Materials（辽宁省材料科学研究院）
Multiple Superconducting Phases in Rhombohedral Heptalayer Graphene
State Key Laboratory of Micro-nano Engineering Science, Tsung-Dao Lee lnstitute & School of Physics and Astronomy, Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shanghai Jiao Tong University（上海交通大学微纳电子学系、李政道理论与研究学院、人工结构量子控制教育部重点实验室）；National Institute for Materials Science（国立材料研究所）；Hefei National Laboratory（合肥国家实验室）；Shanghai Research Center for Quantum Sciences（上海量子科学研究中心）；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong)（粤港澳大湾区（广东）量子科学中心）；Department of Physics, Southern University of Science and Technology（南方科技大学物理系）
Competing Orders Driven by Wigner Crystal Phase in Rhombohedral Graphene
Institute of Physics, Ecole Polytechnique Fédérale de Lausanne（洛桑联邦理工学院物理研究所）；SPEC, CEA, CNRS, Université Paris-Saclay（法国原子能和替代能源委员会、国家科学研究中心、萨克雷大学SPEC实验室）；Department of Physics, Florida State University（佛罗里达州立大学物理系）；National High Magnetic Field Laboratory（国家高磁场实验室）；FSU Quantum Initiative, Florida State University（佛罗里达州立大学FSU量子倡议项目）；Research Center for Functional Materials, National Institute for Materials Science（日本物质材料研究机构功能材料研究中心）
