氧化物异质界面诱导的新奇量子态及其调控是新一代信息功能器件的物理基础，然而目前对其微观机理以及调控规律还缺乏系统的研究。本项目将围绕氧化物异质界面这一主题，聚焦界面新奇量子效应（二维电子气、磁性、金属-绝缘转变等）产生及调控的微观机理。以HAADF和ABF成像技术从原子尺度分析界面处的晶格弛豫、应力分布、过渡金属-氧八面体的倾转与畸变以及氧空位的有序化为基础，以原子分辨率的EDS和EELS分析为特色，揭示界面处成分、价态、配位、电荷转移和轨道耦合等信息，进一步通过DPC技术直接探测氧化物异质界面处局域极化场（电场或磁场）的静态和动态行为，揭示极化方向对界面性质的调控规律以及界面磁性离子之间的交换与耦合作用。最后尝试用原位电镜技术从原子尺度实时观察界面结构和物性在外场作用下的调控规律，为新型氧化物功能电子器件的设计和制备提供依据。

The emergent quantum phenomena at complex oxide interfaces due to the reconstruction of the lattice, charge, spin and orbital states on the nanometer scale have provided a fertile new ground for developing the next generation electronic devices. However, the mechanisms of the origin and control of these novel effects are not well understood at the atomic level. In this project, the combination of the state-of-the-art spherical aberration corrected scanning transmission electron microscopy (Cs-corrected STEM) techniques including high angle annular dark field (HAADF) imaging, annular bright field (ABF) imaging, X-ray energy dispersive spectroscopy (EDS), electron energy-loss spectroscopy (EELS) and differential phase contrast (DPC) imaging will be employed to investigate the microstructures of the oxide heterostructures. The relation between the film growth conditions and the states of the lattice mismatch, charge transfer, spin and orbital coupling will be revealed. The origin of the emergent phenomena such as two dimensional electron gas (2DEG), interface superconductivity, interface magnetism, magneto-electric coupling will be clarified based on the atomic scale structural, chemical and electronic information of the interfaces. Furthermore, in-situ TEM observations of the interfaces under external electric and magnetic field will be performed to reveal the dynamical process in real time. These results will provide valuable information for designing and fabricating the new oxide electronic devices.