论文标题
Kramers节点金属
Kramers Nodal Line Metals
论文作者
论文摘要
最近，有人指出，所有具有自旋轨道耦合（SOC）的手性晶体都可以是kramers Weyl Semimetals（KWSS），它们具有固定在时间反转不变动量时的Weyl点。在这项工作中，我们表明所有具有SOC的非中心非中心材料都可以是新的拓扑材料，我们将其称为Kramers Nodal Line Line Line Metals（KNLMS）。在KNLMS中，有双重变性线，我们称之为Kramers节点线（KNLS），连接时间反转不变的动量。 KNL创建了两种类型的费米表面，即主轴圆环类型和Octdong类型。有趣的是，二维无质量的迪拉克汉密尔顿人描述了Octdong Fermi表面上的所有电子。这些材料支持薄膜中量化的光电电导。我们进一步表明，KNLM可以被视为KWSS的母体状态。因此，我们得出的结论是，所有具有SOC的非中心金属都是拓扑，因为它们可以是KWSS或KNLMS。
Recently, it was pointed out that all chiral crystals with spin-orbit coupling (SOC) can be Kramers Weyl semimetals (KWSs) which possess Weyl points pinned at time-reversal invariant momenta. In this work, we show that all achiral non-centrosymmetric materials with SOC can be a new class of topological materials, which we term Kramers nodal line metals (KNLMs). In KNLMs, there are doubly degenerate lines, which we call Kramers nodal lines (KNLs), connecting time-reversal invariant momenta. The KNLs create two types of Fermi surfaces, namely, the spindle torus type and the octdong type. Interestingly, all the electrons on octdong Fermi surfaces are described by two-dimensional massless Dirac Hamiltonians. These materials support quantized optical conductance in thin films. We further show that KNLMs can be regarded as parent states of KWSs. Therefore, we conclude that all non-centrosymmetric metals with SOC are topological, as they can be either KWSs or KNLMs.
