拓扑半金属的低能态电子激发符合狄拉克方程，使其呈现出许多新奇的物理性质，在拓扑量子计算和自旋电子学等方面有巨大的应用潜力。随着研究的不断深入，尤其在拓扑超导态和磁性量子输运等方面，科学家们发现拓扑半金属材料中的电子关联效应具有重要的科学研究价值。最近的研究显示钙钛矿结构CaIrO3拥有极高的电子迁移率和明显的量子振荡，是少数被证实具备强电子关联的Dirac半金属材料。但角分辨光电子能谱技术对这类钙钛矿结构材料无法进行有效的电子结构表征，从而导致缺乏研究其电子关联效应的关键能谱信息。本项目拟采用氧化物分子束外延技术实现高质量CaIrO3外延薄膜的制备，进而利用原位角分辨光电子能谱技术直接测量该体系中的电子结构，包括Dirac线性能带和无能隙的半金属电子态，进而结合理论计算深入探究其电子-电子关联效应、自旋轨道耦合及晶体结构等多自由度相互作用机理。

The low-energy state electrons excitation of topological semimetals is in accordance with the Dirac equation, which induces many novel physical properties, and has great potential for applications in the topological quantum computing and spin electronics. With further research in superconducting states and magnetic quantum transport, scientists have found that the electron correlation in topological semi-metallic materials is worthy of scientific attention. According to recent research, the perovskite CaIrO3 has extremely high electron mobility and obvious quantum oscillation and is one of the few candidates of correlated topological semimetals that have been experimentally identified. However, the perovskite structure of CaIrO3 restricts the experimental research. In this project, we intend to prepare perovskite CaIrO3 epitaxial films by molecular beam epitaxy (MBE) technology, and then, use in-situ angle-resolved photoemission spectroscopy (ARPES) to directly observe the electronic structure in this materials, including Dirac linear bands and semi-metal states. Combined with theoretical calculations, we can promote the study on the interaction mechanism of electron-electron correlation, spin-orbit coupling, and crystal structure.