Room-Temperature Ferroelectricity in Hexagonally Layered α-In₂Se₃ Nanoflakes down to the Monolayer Limit

Fei Xue^*, Weijin Hu, Ko Chun Lee, Li Syuan Lu, Junwei Zhang, Hao Ling Tang, Ali Han, Wei Ting Hsu, Shaobo Tu, Wen-Hao Chang, Chen Hsin Lien, Jr Hau He, Zhidong Zhang, Lain Jong Li, Xixiang Zhang