supported by the National Natu-ral Science Foundation of China(Grants No.12174220 and No.12074217);the Shandong Provincial Science Foundation for Excellent Young Scholars(Grant No.ZR2023YQ001);the Taishan Young Scholar Program of Shandong Province;the Qilu Young Scholar Pro-gram of Shandong University.
Higher-order band topology not only enriches our understanding of topological phases but also unveils pioneering lower-dimensional boundary states,which harbors substantial potential for next-generation device applica...