Nontrivial Topological Properties and Synthesis of Sn₂CoS with L2₁ Structure.

ABSTRACT: We synthesize Sn₂CoS in experiment and study its topological properties in theory. By first-principles calculations, we study the band structure and surface state of Sn₂CoS with L2₁ structure. It is found that the material has type-II nodal line in the Brillouin zone and clear drumhead-like surface state when the spin-orbit coupling is not considered. In the case of spin-orbit coupling, the nodal line will open gap, leaving the Dirac points. To check the stability of the material in nature, we synthesize Sn₂CoS nanowires with L2₁ structure in an anodic aluminum oxide (AAO) template directly by the electrochemical deposition (ECD) method with direct current (DC). Additionally, the diameter of the typical Sn₂CoS nanowires is about 70 nm, with a length of about 70 μm. The Sn₂CoS nanowires are single crystals with an axis direction of [100], and the lattice constant determined by XRD and TEM is 6.0 Å. Overall, our work provides realistic material to study the nodal line and Dirac fermions.

SUBMITTER: Chen G 

PROVIDER: S-EPMC10141049 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature