Weyl-Kondo semimetals in nonsymmorphic systems
Weyl-Kondo semimetals in nonsymmorphic systems
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DOI：
10.1103/physrevb.101.075138
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发表时间：
2020-02-28
影响因子：
3.7
通讯作者：
Si, Qimiao
中科院分区：
文献类型：
--
作者：
Grefe, Sarah E.;Lai, Hsin-Hua;Si, Qimiao
目前有相当大的兴趣探索强相关金属的电子拓扑结构，重费米子系统提供了一个有前途的设置。近年来，在理论和实验研究中同时发现了一种Weyl-Kondo半金属相。理论工作是在时间反转不变但逆对称破缺的Kondo晶格模型中进行的。在本文中，我们详细地展示了非对称空间群对称性和强相关如何合作形成速度高度降低的Weyl节点激发，并将产生的Weyl节点固定在费米能量上。本文进一步分析了Weyl-Kondo溶液的倾斜变化，最近在理解Ce3Bi4Pd3中的大自发霍尔效应的背景下考虑了这种效应（Dzsaber et al., arXiv:1811.02819）。我们讨论了我们的结果对重费米子金属的整体相图的富集，以及对拓扑半金属在其他强相关环境中空间群对称性的增强的影响。
There is considerable current interest to explore electronic topology in strongly correlated metals, with heavy fermion systems providing a promising setting. Recently, a Weyl-Kondo semimetal phase has been concurrently discovered in theoretical and experimental studies. The theoretical work was carried out in a Kondo lattice model that is time-reversal invariant but inversion-symmetry breaking. In this paper, we show in some detail how nonsymmorphic space-group symmetry and strong correlations cooperate to form Weyl nodal excitations with highly reduced velocity and pin the resulting Weyl nodes to the Fermi energy. A tilted variation of the Weyl-Kondo solution is further analyzed here, following the recent consideration of such effect in the context of understanding a large spontaneous Hall effect in Ce3Bi4Pd3 (Dzsaber et al., arXiv:1811.02819). We discuss the implications of our results for the enrichment of the global phase diagram of heavy fermion metals, and for the space-group symmetry enforcement of topological semimetals in other strongly correlated settings.