NON-HERMITIAN SKIN EFFECT AND DELOCALIZED EDGE STATES IN PHOTONIC CRYSTALS WITH ANOMALOUS PARITY-TIME SYMMETRY

Non-Hermitian skin effect denotes the exponential localization of a large number eigen-states in non-Hermitian lattice under open boundary conditions. Such non-Hermiticity-induced can offset penetration depth in-gap edge states, leading to counterintuitive delocalized modes, which have not been studied realistic photonic system such as crystals. Here, we analytically reveal and states Maxwell's equations for chiral crystals with anomalous parity-time symmetry. Remarkably, rigorously prove that is inversely proportional frequency real part chirality. Our findings pave way towards exploring novel phenomena applications continuous equations.