Magnetic and noncentrosymmetric Weyl fermion semimetals in the R AlGe family of compounds (R= rare earth)

Guoqing Chang, Bahadur Singh, Su Yang Xu, Guang Bian, Shin Ming Huang, Chuang Han Hsu, Ilya Belopolski, Nasser Alidoust, Daniel S. Sanchez, Hao Zheng, Hong Lu, Xiao Zhang, Yi Bian, Tay Rong Chang, Horng Tay Jeng, Arun Bansil, Han Hsu, Shuang Jia, Titus Neupert, Hsin LinM. Zahid Hasan

研究成果: 雜誌貢獻期刊論文同行評審

87 引文 斯高帕斯(Scopus)

摘要

Weyl semimetals are novel topological conductors that host Weyl fermions as emergent quasiparticles. In this Rapid Communication, we propose a new type of Weyl semimetal state that breaks both time-reversal symmetry and inversion symmetry in the RAlGe (R=rare-earth) family. Compared to previous predictions of magnetic Weyl semimetal candidates, the prediction of Weyl nodes in RAlGe is more robust and less dependent on the details of the magnetism because the Weyl nodes are generated already by the inversion breaking and the ferromagnetism acts as a simple Zeeman coupling that shifts the Weyl nodes in k space. Moreover, RAlGe offers remarkable tunability, which covers all varieties of Weyl semimetals including type I, type II, inversion breaking, and time-reversal breaking, depending on a suitable choice of the rare-earth elements. Furthermore, the unique noncentrosymmetric and ferromagnetic Weyl semimetal state in RAlGe enables the generation of spin currents.

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文章編號041104
期刊Physical Review B
97
發行號4
DOIs
出版狀態已出版 - 9 1月 2018

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