Wang Yu-Jia, Geng Wan-Rong, Tang Yun-Long, Zhu Yin-Lian, Ma Xiu-Liang. Construction of novel ferroelectric topological structures and their structural characteristics at sub-angström levelJ. Acta Physica Sinica, 2020, 69(21): 216801. DOI: 10.7498/aps.69.20201718