Topological corner modes in a brick lattice with nonsymmorphic symmetry

Article

关键词: CRYSTALLINE INSULATOR;    WANNIER FUNCTIONS;    REALIZATION;   

DOI  :  10.1103/PhysRevB.102.035142

来源: SCIE

【 摘 要 】

The quest for new realizations of higher-order topological system has garnered much recent attention. In this work, we propose a paradigmatic brick lattice model where corner modes require protection by nonsymmorphic symmetry in addition to two commuting mirror symmetries. Unlike the well-known square corner mode lattice, it has an odd number of occupied bands, which necessitates a different definition for the Z(2) x Z(2) topological invariant. By studying both the quadrupolar polarization and effective edge model, our study culminates in a phase diagram containing two distinct topological regimes. Our brick lattice corner modes can be realized in an RLC circuit setup and detected via colossal topolectrical resonances.

【 授权许可】

Free