Coexistence of Weyl semimetal and Weyl nodal loop semimetal phases in a collinear antiferromagnet

Abstract

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.

6 pages, 4 figures

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Cited by in corpus (9)

• Crystal Thermal Transport in Altermagnetic RuO2
• Observation of surface Fermi arcs in altermagnetic Weyl semimetal CrSb
• Quasi-one-dimensional spin transport in altermagnetic $Z^3$ nodal net metals
• Multi higher-order Dirac and nodal line semimetals
• Low-lying Electronic Structure of Rare-Earth Based Topological Nodal Line Semimetal Candidate DySbTe
• Coexistence of topological semimetal states in holography
• Lattice dynamics of altermagnetic ruthenium oxide RuO${}_2$
• Electronic Structure of a Nodal Line Semimetal Candidate TbSbTe
• Electronic band structure of a nodal line semimetal candidate ErSbTe