期刊论文详细信息
Ferromagnetic Weyl fermions in CrO2
Article
关键词: TOTAL-ENERGY CALCULATIONS;    WAVE BASIS-SET;    SEMIMETAL;    DISCOVERY;    ARCS;   
DOI  :  10.1103/PhysRevB.97.195157
来源: SCIE
【 摘 要 】

The interplay between symmetry and magnetization directions in ferromagnetic materials provides an exotic platform to investigate the symmetry-protected topological order. In this work, we propose that unexpected ferromagnetic topological features, such as triple fermions and type-I and type-II Weyl fermions, can emerge in three phases of chromium dioxide (CrO2), i.e., rutile CrO2, orthorhombic CrO2 of the CaCl2 type, and pyrite CrO2. Using first-principles calculations and topology analysis, we reveal that the breaking of the spin-rotation symmetry leads to tunable Weyl fermions that are robust against spin-orbital coupling, which can be easily realized by manipulating the magnetization direction. In particular, rutile CrO2, a well-known half-metallic ferromagnet used in magnetic recording tapes, is an ideal candidate to overcome obstacles of studying ferromagnetic topological semimetals in experiments. The topological features in different phases of CrO2 may bridge the gap between the band topology and local chemical bonding. Our findings substantially advance the experimental realization of ferromagnetic Weyl semimetals. More importantly, room-temperature ferromagnetic Weyl fermions in CrO2 may give rise to promising applications related to the topological phenomena in industry.

【 授权许可】

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