Non-Hermitian topology provides an emergent research frontier for studying unconventional topological phenomena and developing new materials and applications.Here,we study the non-Hermitian Chern bands and the associa...Non-Hermitian topology provides an emergent research frontier for studying unconventional topological phenomena and developing new materials and applications.Here,we study the non-Hermitian Chern bands and the associated non-Hermitian skin effects in Floquet checkerboard lattices with synthetic gauge fluxes.Such lattices can be realized in a network of coupled resonator optical waveguides in two dimensions or in an array of evanescently coupled helical optical waveguides in three dimensions.Without invoking nonreciprocal couplings,the system exhibits versatile non-Hermitian topological phases that support various skin-topological effects.Remarkably,the non-Hermitian skin effect can be engineered by changing the symmetry,revealing rich non-Hermitian topological bulk-boundary correspondences.Our system offers excellent controllability and experimental feasibility,making it appealing for exploring diverse non-Hermitian topological phenomena in photonics.展开更多
文摘Non-Hermitian topology provides an emergent research frontier for studying unconventional topological phenomena and developing new materials and applications.Here,we study the non-Hermitian Chern bands and the associated non-Hermitian skin effects in Floquet checkerboard lattices with synthetic gauge fluxes.Such lattices can be realized in a network of coupled resonator optical waveguides in two dimensions or in an array of evanescently coupled helical optical waveguides in three dimensions.Without invoking nonreciprocal couplings,the system exhibits versatile non-Hermitian topological phases that support various skin-topological effects.Remarkably,the non-Hermitian skin effect can be engineered by changing the symmetry,revealing rich non-Hermitian topological bulk-boundary correspondences.Our system offers excellent controllability and experimental feasibility,making it appealing for exploring diverse non-Hermitian topological phenomena in photonics.
