2024/09/28 by Cheng-Ming Miao, Yuhao Wan, Miao, Cheng-Ming +5
Physics and Astronomy · #Topological Materials and Phenomena #Cold Atom Physics and Bose-Einstein Condensates #Atomic and Subatomic Physics Research
paper · pdf · doi:10.48550/arxiv.2409.19328
We propose a universal theory for tunable second-order topological corner states induced by interlayer coupling in bilayer Chern insulators with opposite Chern numbers. We demonstrate that the existence of the topological corner state is determined by the relationship between the twist angle of the bilayer Chern insulators and the normal angles of the two sides of the corner. In addition, the position of these corner states can be sensitively controlled by the twist angle, as confirmed by a rigorous analysis of edge state theory. Our findings serve as a universal theory, opening avenues for the design and realization of higher-order topological materials.