[7] L. Lu, J. D. Joannopoulos, M. Soljačić. Topological photonics. Nat. Photonics, 8, 821-829(2014).
[8] T. Ozawa, H. M. Price, A. Amo. Topological photonics. Rev. Mod. Phys., 91, 015006(2019).
[9] Z. Chen, M. Segev. Highlighting photonics: looking into the next decade. eLight, 1, 2(2021).
[20] B. Xie, H.-X. Wang, X. Zhang. Higher-order band topology. Nat. Rev. Phys., 3, 520-532(2021).
[47] L. Yuan, Q. Lin, M. Xiao. Synthetic dimension in photonics. Optica, 5, 1396-1405(2018).