Ni, H., Zhou, Q., Luo, J., Teri, G., Pan, L., Ye, L., Jia, Q., Huang, P., Liu, P., Wang, C., Zhang, Z., Fu, D., Zhang, Y. (2025). Lone pair expression in fluorinated two-dimensional hybrid perovskite enables multiaxial ferroelectricity and nonlinear optical response. Nature Communications. https://doi.org/10.1038/s41467-025-63134-6