Crossing-line-node semimetals: General theory and application to rare-earth trihydrides
Crossing-line-node semimetals: General theory and application to rare-earth trihydrides
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DOI：
10.1103/physrevb.95.245208
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发表时间：
2017-03
影响因子：
3.7
通讯作者：
S. Kobayashi;Y. Yamakawa;A. Yamakage;Takumi Inohara;Y. Okamoto;Yukio Tanaka
中科院分区：
文献类型：
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作者：
S. Kobayashi;Y. Yamakawa;A. Yamakage;Takumi Inohara;Y. Okamoto;Yukio Tanaka
在半金属的能带隙中发现了多个线节点，保持了镜面反射对称性。在点群对称条件下，对具有交叉点的多个线节点（交叉线节点）的可能构型进行了分类。考虑到自旋轨道相互作用（SOI），我们还对从跨线节点Dirac半金属到其他拓扑相（如拓扑绝缘体和点节点半金属）的拓扑相变进行了分类。这项研究使人们能够在没有SOI的情况下从带结构中找到交叉线节点半金属材料及其在SOI存在时的行为，而无需详细计算。以${\ mathm {HoD}}_{3}$结构的六方稀土三氢化物为例，阐明了它是具有三个线节点的交叉线节点狄拉克半金属。
Multiple line nodes in energy-band gaps are found in semimetals preserving mirror-reflection symmetry. We classify possible configurations of multiple line nodes with crossing points (crossing line nodes) under point-group symmetry. Taking the spin-orbit interaction (SOI) into account, we also classify topological phase transitions from crossing-line-node Dirac semimetals to other topological phases, e.g., topological insulators and point-node semimetals. This study enables one to find crossing-line-node semimetal materials and their behavior in the presence of SOI from the band structure in the absence of SOI without detailed calculations. As an example, the theory applies to hexagonal rare-earth trihydrides with the ${\mathrm{HoD}}_{3}$ structure and clarifies that it is a crossing-line-node Dirac semimetal hosting three line nodes.