Instability of edge states and a singular-value-based diagnostic scheme for the topology in one-dimensional Floquet non-Hermitian systems (opens in new tab)

Author(s): Hong Wu, Xue-Min Yang, Jian Li, and Hui LiuTopological edge states in non-Hermitian systems are generally believed to be robust based on non-Bloch topology. Here, we show that in the Floquet non-Hermitian Su-Schrieffer-Heeger model, infinitesimal symmetry-preserving perturbations can completely destroy edge states, revealing the breakdown of…[Phys. Rev. B 113, 235123] Published Mon Jun 15, 2026