Toroidal polar topology in strained ferroelectric polymer

Mengfan Guo, Changqing Guo, Jian Han, Shulin Chen, Shan He, Tongxiang Tang, Qian Li, Joseph Strzalka, Jing Ma, Di Yi, Ke Wang, Ben Xu, Peng Gao, Houbing Huang, Long Qing Chen, Shujun Zhang, Yuan Hua Lin, Ce Wen Nan^*, Yang Shen^*