2017/05/15 by Jianpeng Sun, Jian-Peng Sun, Dong Zhang +1 · 1 citation
Materials Science · Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Chiral anomaly #Chirality (physics) #Condensed matter physics #Coupling (piping) #Degenerate energy levels #Fermi Gamma-ray Space Telescope #Fermion #Geometry #Graphene research and applications #Line (geometry) #Materials science #Mathematics #Mirror symmetry #NODAL #Physics #Position and momentum space #Quantum mechanics #Ring (chemistry) #Surface (topology) #Topological Materials and Phenomena #Topology (electrical circuits) #Type (biology) #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.96.045121
published as Physical Review B 96, 045121 (2017)
arxiv created 2017/05/15 · openalex created_date 2017/05/26 · openalex publication_date 2017/07/17 · arxiv updated 2017/07/25 · openalex updated_date 2026/08/05
We theoretically propose that the single-crystal formed TaS is a new type of topological metal, hosting ring-shaped gapless nodal lines and triply degenerate points (TDPs) in the absence of spin-orbit coupling (SOC). In the presence of SOC, each TDP splits into four TDPs along the high-symmetric line in momentum space, and one of the nodal rings remains closed due to the protection of the mirror reflection symmetry, while another nodal ring is fully gapped and transforms into six pairs of Weyl points (WPs) carrying opposite chirality. The electronic structures of the projected surfaces are also discussed, the unique Fermi arcs are observed, and the chirality remains or vanishes depending on the projection directions. On the (010) projected surface, one may observe a Lifshitz transition. The new type of topological metal TaS is stable and experimentally achievable, and the coexistence of topological nodal lines, WPs, and TDPs in TaS makes it a potential candidate to study the interplay between different types of topological fermions.