Elemental topological ferroelectrics and polar metals of few-layer materials, Hu Zhang, Lulu Zhao, RuiFeng Zhang, Chendong Jin, Ruqian Lian, Peng-Lai Gong, RuiNing Wang, JiangLong Wang, and Xing-Qiang Shi #CondensedMatter #Materials go.aps.org/3yMd8CP