论文标题
II型拓扑金属
Type-II topological metals
论文作者
论文摘要
拓扑金属（TMS）是一种特殊的金属材料，具有在费米能量附近的非平凡带交叉，引起了特殊的准粒子激发。可以根据这些带交叉的特征对TMS进行分类。例如，根据交叉的维度，可以将TMS分类为节点点，节点线和节点表面金属。另一个重要的属性是分散类型。根据交叉点周围局部分散的倾斜程度，我们有I型和II型分散体。这导致材料的物理性质显着区别，这是由于其对比的费米表面拓扑。在本文中，我们简要回顾了该研究方向的最新进展，重点介绍了II型鼻点和Nodal-line TMS的概念，物理特性以及实质性实现。
Topological metals (TMs) are a kind of special metallic materials, which feature nontrivial band crossings near the Fermi energy, giving rise to peculiar quasiparticle excitations. TMs can be classified based on the characteristics of these band crossings. For example, according to the dimensionality of the crossing, TMs can be classified into nodal-point, nodal-line, and nodal-surface metals. Another important property is the type of dispersion. According to degree of the tilt of the local dispersion around the crossing, we have type-I and type-II dispersions. This leads to significant distinctions in the physical properties of the materials, owing to their contrasting Fermi surface topologies. In this article, we briefly review the recent advances in this research direction, focusing on the concepts, the physical properties, and the material realizations of the type-II nodal-point and nodal-line TMs.
