#Octupole corner state in a three-dimensional topological circuit
“#Octupole corner state in a three-dimensional topological circuit” (a) Theoretical mode of the unit cell. (b) Fabricated sample which contains 2.5×2.5×2.5 unit cells. Credit: by Shuo Liu, Shaojie Ma, Qian Zhang, Lei Zhang, Cheng Yang, Oubo You, Wenlong Gao, Yuanjiang Xiang, Tie Jun Cui & Shuang Zhang Higher-order topological insulators featuring quantized bulk polarizations and…