论文标题
在共线抗fiferromagnet中的Weyl半准和Weyl节点环半立相的共存
Coexistence of Weyl semimetal and Weyl nodal loop semimetal phases in a collinear antiferromagnet
论文作者
论文摘要
具有异常量子响应的抗铁磁铁（AFMS）已从对称和拓扑观点从对称性和拓扑结构中理解其磁性和电子结构的新进展。两个典型的拓扑状态是共线抗磁性WEYL半磁性（WSM）和Weyl节点环半计（WNLSM）。与铁磁体和非共线AFM中的对应物相比，共线AFMS中的WSM和WNLSM仍在等待实验验证。在这项工作中，我们从理论上预测了过渡金属氧化物RUO2中Weyl点（WPS）和Weyl节点环（WNL）的共存。由于小的磁晶对偏度能量，WPS和WNL可以通过调谐Neel载体彼此转换。此外，由于WPS非常接近费米水平，WNL甚至越过费米水平，因此可以通过光发射和STM方法轻松探测RUO2中的拓扑状态。我们的结果提供了一个有希望的材料平台，用于研究共线AFMS中的WSM和WNLSM状态。
Antiferromagnets (AFMs) with anomalous quantum responses have lead to new progress for the understanding of their magnetic and electronic structures from symmetry and topology points of view. Two typical topological states are the collinear antiferromagnetic Weyl semimetal (WSM) and Weyl nodal loop semimetal (WNLSM). In comparison with the counterparts in ferromagnets and non-collinear AFMs, the WSMs and WNLSMs in collinear AFMs are still waiting for experimental verification. In this work, we theoretically predicted the coexistence of Weyl points (WPs) and Weyl nodal loops (WNLs) in transition metal oxide RuO2. Owing to the small magnetocrystalline anisotropy energy, the WPs and WNLs can transform to each other via tuning the Neel vector. Moreover, since the WPs are very close to Fermi level and the WNLs are even crossing Fermi level, the topological states in RuO2 can be easily probed by photoemission and STM methods. Our result provides a promising material platform for the study of WSM and WNLSM states in collinear AFMs.
