Topological invariant and anomalous edge modes of strongly nonlinear systems
Topological invariant and anomalous edge modes of strongly nonlinear systems
Despite the extensive studies of topological states, their characterization in strongly nonlinear classical systems has been lacking. In this work, we identify the proper definition of Berry phase for nonlinear bulk waves and characterize topological phases in one-dimensional (1D) generalized nonlinear Schrödinger equations in the strongly nonlinear regime, where the …