理论预言锰酸镧（LaMnO3）超晶格中蕴含着丰富的量子态，在开发低功耗电子器件领域具有重要应用潜力。实验上如何调控超晶格中的应力以及Jahn-Teller失配、极性失配和各种晶格失配与超晶格磁电输运性能之间的内在关联，是最为关键的科学问题。本项目以LaMnO3系超晶格中异常磁交换偏置现象为突破口，详细研究超晶格中应力和失配诱导的磁电耦合输运性能。首先设计并利用激光分子束外延技术生长具有不同晶格应力和失配度的LaMnO3/LaXO3（X=Al，Ni，Sc）超晶格；进而建立超晶格结构参数与外延生长参数之间的关系，阐明该超晶格中Jahn-Teller失配和极性失配产生的原因和调控方法；最后通过对超晶格电磁输运性能的测试分析，结合第一性原理计算结果，阐明超晶格中晶格、电荷、自旋和轨道的关联作用以及磁电耦合输运机制。这项研究不仅在学术上具有重要意义，还可为进一步开发新型钙钛矿微电子器件提供材料基础。

LaMnO3-based superlattices have important application potential in the development of low-power electronic devices since the novel quantum states were theoretical discovered in these superlattices. Experimentally, there are two key issues should be solved. One is how to adjust the lattice stress, Jahn-Teller interaction and polarity mismatch. Second is to elucidate the relationship between the lattice mismatch, electrical and magnetic properties. In this project we will take the magnetic exchange bias as a breakthrough to systematically study the lattice stress and distortion induced conducting behavior and exchange bias of LaMnO3 superlattices theoretically and experimentally. At first, we will design and grow LaMnO3 superlattices using laser molecular beam epitaxy with different lattice stress and mismatch. Then, we will elucidate the relationship between the structural parameters and the epitaxy growth parameters, and clarify the strategy of adjusting the Jahn-Teller interaction and polarity mismatch in the superlattices. At last, we will study the electrical and magnetic properties of the superlattices. Combining with the simulating results, the correlation of lattice, charge, spin and orbital will be expounded. The mechanism of magnetoelectric coupling transport will be discussed. This project not only has important academic significance, but also provides material basis for further development of new perovskite microelectronic devices.