Lone pair expression in fluorinated two-dimensional hybrid perovskite enables multiaxial ferroelectricity and nonlinear optical response

H Hao-Fei Ni Q Qi-Fang Zhou J Jia-Qi Luo (Laboratory of Smart Nanomedicines, the Second Affiliated Hospital, School of Medicine) G Gele Teri L Lei Pan (Department of Chemistry) L Lou-Kai Ye Q Qiang-Qiang Jia P Pei-Zhi Huang P Pei-Guo Liu C Chang-Feng Wang Z Zhi-Xu Zhang D Da-Wei Fu (Institute for Science and Applications of Molecular Ferroelectrics, Key Laboratory of the Ministry of Education for Advanced Catalysis Materials) Y Yi Zhang