2020/07/25 by Tingli He, Xiaoming Zhang, Tie Yang +3
Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Combinatorics #Condensed matter physics #Fermion #Ferromagnetism #Geometric phase #Geometry #Mathematics #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spintronics #Tetragonal crystal system #Topological Materials and Phenomena #Topology (electrical circuits) #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevmaterials.5.024205
published as Phys. Rev. Materials 5, 024205 (2021) · 8 pages, 9 figures
arxiv created 2020/07/25 · openalex created_date 2020/07/29 · openalex publication_date 2021/02/19 · arxiv updated 2021/02/24 · openalex updated_date 2026/08/05
Here we systematically investigate the structure, phase stability, half-metallicity, and topological electronic structure for a topological spintronic material NaV2O4. The material has a tetragonal structure with excellent dynamical and thermal stabilities. It shows a half-metallic ground state, where only the spin-up bands are present near the Fermi level. These bands are demonstrated to form a nodal line with the double degeneracy on the kz=0 plane. The nodal line is robust against spin-orbit coupling, under the protection of the mirror symmetry. The nodal line band structure is very clean, thus the drumhead surface states can be clearly identified. Remarkably, the nodal line and drumhead surface states have the 100% spin polarization, which are highly desirable for spintronics applications. In addition, by shifting the magnetic field in-plane, we find that the nodal line can transform into a single pair of Weyl nodes. The nodal-line and Weyl-node fermions in the bulk, as well as the drumhead fermions on the surface are all fully spin-polarized, which may generate interesting physical properties and promising applications.