2016/04/30 by Guoqing Chang, Bahadur Singh, Su-Yang Xu +21 · 4 citations
Materials Science · Mathematics · Physics and Astronomy · #2D Materials and Applications #Band gap #Fermion #Geology #Graphene research and applications #Massless particle #Mathematics #Physics #Quantum mechanics #Quasiparticle #Semimetal #Superconductivity #Topological Materials and Phenomena #Topology (electrical circuits) #Type (biology) #Weyl semimetal #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.97.041104
published as Phys. Rev. B 97, 041104 (2018) · This paper reports theoretical prediction of Weyl semimetal (type-I and type-II) states in the R-Al-X family. For the experimental discovery, see our earlier paper at http://arxiv.org/abs/1603.07318
openalex created_date 2016/06/24 · openalex publication_date 2018/01/09 · arxiv created 2018/01/11 · arxiv updated 2018/01/17 · openalex updated_date 2026/08/06
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\ensuremath-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.