$\mathcal{P}\mathcal{T}$-symmetric ladders with a scattering core

Abstract

We consider a $\mathcal{P}\mathcal{T}$-symmetric chain (ladder-shaped) system governed by the discrete nonlinear Schrödinger equation where the cubic nonlinearity is carried solely by two central "rungs" of the ladder. Two branches of scattering solutions for incident plane waves are found. We systematically construct these solutions, analyze their stability, and discuss non-reciprocity of the transmission associated with them. To relate these results to finite-size wavepacket dynamics, we also perform direct simulations of the evolution of the wavepackets, which confirm that the transmission is indeed asymmetric in this nonlinear system with the mutually balanced gain and loss.

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Cited by in corpus (4)

• Nonlinear waves in $\mathcal{P}\mathcal{T}$-symmetric systems
• Interaction of sine-Gordon kinks and breathers with a $\mathcal{P}\mathcal{T}$-symmetric defect
• Unidirectional transport of wave packets through tilted discrete breathers in nonlinear lattices with asymmetric defects
• Dark Soliton Scattering in Symmetric and Asymmetric Double Potential Barriers