From node-line semimetals to large-gap quantum spin Hall states in a family of pentagonal group-IVA chalcogenide
From node-line semimetals to large-gap quantum spin Hall states in a family of pentagonal group-IVA chalcogenide
Two-dimensional (2D) topological insulators (TIs) have attracted tremendous research interest from both theoretical and experimental fields in recent years. However, it is much less investigated in realizing node line (NL) semimetals in 2D materials.Combining first-principles calculations and $k \cdot p$ model, we find that NL phases emerge in p-CS$_2$ and …