Wannier-type photonic higher-order topological corner states induced solely by gain and loss
Wannier-type photonic higher-order topological corner states induced solely by gain and loss
Photonic crystals have provided a controllable platform to examine excitingly new topological states in open systems. In this work, we reveal photonic topological corner states in a photonic graphene with mirror-symmetrically patterned gain and loss. Such a nontrivial Wannier-type higher-order topological phase is achieved through solely tuning on-site gain/loss strengths, …