Diagnosis of bulk phase diagram of nonreciprocal topological lattices by impurity modes
Diagnosis of bulk phase diagram of nonreciprocal topological lattices by impurity modes
We study the single-impurity problem in the non-Hermitian lattice described by the nonreciprocal Su-Schrieffer-Heeger model and obtain the phase diagram of localized bound states induced by the impurity. The existence of analytical results permits us to determine the phase boundaries exactly, which separate regions with different numbers of bound states. …