2017/08/31 by Jan Behrends, Jun‐Won Rhim, Jun-Won Rhim +3 · 23 citations
Mathematics · Physics and Astronomy · #Band gap #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Fermi Gamma-ray Space Telescope #Fermi surface #Geometric phase #Geometry #Homogeneous space #Lattice (music) #Mathematics #NODAL #Physics #Quantum Mechanics and Non-Hermitian Physics #Semimetal #Superlattice #Theoretical physics #Topological Materials and Phenomena #Topology (electrical circuits) #Translational symmetry #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.96.245101
published in Physical review. B./Physical review. B 96(24) (American Physical Society) · 11 pages, 8 figures, Editors' Suggestion
openalex publication_date 2017/12/01 · arxiv created 2017/12/07 · arxiv updated 2017/12/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The band crossings at the Fermi level of a Weyl semimetal are generally stable against disorder. The only way to open a gap in the spectrum is by annihilating pairs of Weyl nodes. Here, the authors show that coupling Weyl nodes by a superlattice does not always lead to gap opening, but does lead to a variety of different phases, including a nodal-line semimetal. The authors uncover a novel mechanism that protects the nodal line, a combination of a fractional lattice translation and charge-conjugation symmetry, and show that its in-gap surface states are not necessarily exponentially localized.