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Three node Weyl complex in nonmagnetic crystals

delete2026-09-15
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OA
AI
H
Hui-Jing Zheng
Y
Yan Gao *
Y
Yanfeng Ge
X
Xiang‐Feng Zhou *
刘勇 封面图
刘勇 (Yong Liu)
Z
Zhong-Yi Lu
DOI：10.1038/s42005-026-02854-7delete
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摘要

摘要

En 中文
尼尔森-二并三定理要求晶体中威耳点的总手征电荷为零，这通常导致所有携带单位电荷的节点数量为偶数。基于对所有230个晶体学空间群的彻底对称性分析，发现具有三重、四重或六重旋转对称性的非磁性手征晶体可以在自旋无关极限下容纳一个电荷中性的三节点威耳复合体。该状态包含一个高对称点上的电荷为二的威耳点以及高对称线上的两个带相反单位电荷的威耳点。在对称性约束的指导下，第一性原理计算识别出三种具有弱自旋-轨道耦合的手征硼同素异形体，其自旋无关的能带结构在费米能级附近实现了该复合体。晶体对称性决定了节点是形成共线排列还是三角形排列，从而导致具有特征性表面费米弧连通性，这可能提供光谱特征。我们确定了支持这种最小混合电荷威耳状态的39个手征空间群。威耳点通常成偶数出现，以使其总拓扑电荷相互抵消。作者对非磁性晶体中的三节点威耳复合体进行了分类，确定了39个支持的空间群，并提出三种弱自旋-轨道耦合的硼同素异形体，其自旋无关的能带实现了该状态。

期刊

Communications Physics 封面图
Communications Physics
IF:
5.8
论文数:
2.8K
被引数:
9.2K

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