新颖原子利伯晶格的搭建及其拓扑与磁学性质研究

在一定自旋轨道耦合作用下,利伯晶格能带具有一个狄拉克锥且还有一恰好穿过狄拉克点的平带，近年来受到研究者的广泛关注。理论预言利伯晶格有新颖的拓扑效应及平带磁性，但其实验研究尤其是电子体系利伯晶格的实验研究才刚刚开始，且在磁性方面的实验研究还是一片空白。本申请拟利用低温扫描隧道显微镜原子操纵技术在金属单晶、HOPG等衬底表面采用具有不同自旋轨道耦合特性的Pt、Pd、Bi等原子以及不同磁性原子Fe、Co、Ni等原子构建拓扑或磁性利伯晶格，通过调节晶格常数来控制原子间的相互作用，并结合不同温度、磁场下的扫描隧道谱、自旋极化扫描隧道显微镜来研究具有不同自旋轨道耦合、不同磁性的利伯晶格特性，并表征其可能的拓扑相变和磁相变。这些研究将有助于加深对利伯晶格拓扑性质和平带磁性的理解，为开发其潜在运用提供基础。

Given proper spin-orbit interaction, Lieb Lattices possess a Dirac core with a flat band touching the Dirac point thus attract great attention recently. Theoretically, it was predicted that Lieb lattices can have novel topological properties and flat band magnetism. Their experimental studies, however, just began especially in the electronic system. In addition, there is no experimental report on the study of their magnetism so far. In this proposal, we propose to utilize the atomic manipulation technique to build atomic Lieb lattices with atoms with strong spin orbit interaction such as Pt, Pd and Bi, as well as magnetic atoms such as Fe, Co and Ni. Moreover, we plan to use the scanning tunneling spectroscopy and spin polarized scanning tunneling microscopy to explore their topological properties and magnetism as well as their evolution with lattice constant, temperature and magnetic field. These studies are important in gaining deeper understanding of the Lieb Lattices and for the exploration of potential applications.