High winding number in rhombohedrally stacked Su-Schrieffer-Heeger multilayers
Phys. Rev. B 114, 024203 – Published 6 July, 2026
DOI: https://doi.org/10.1103/ctfq-jsj1
Abstract
We study the topological properties of rhombohedrally stacked -layer Su-Schrieffer-Heeger networks with interlayer coupling. We find that these systems exhibit -fold degenerate zero-energy edge states with winding number , providing a direct route to high winding number topological phases where equals the layer number. Using effective Hamiltonian theory, we demonstrate that the winding number scales linearly with through a layer-by-layer topological amplification mechanism. We introduce the Wigner entropy as a detection method for these edge states, showing that topological edge states exhibit significantly enhanced Wigner entropy compared to bulk states. Our results establish rhombohedral stacking as a systematic approach for engineering high winding number topological insulators with potential applications in quantum information processing.