Solitons in one-dimensional non-Hermitian moiré photonic lattice

Abstract

We study the excitation and stabilization of gap solitons and dipole solitons in a non-Hermitian moiré photonic lattice with self-focusing effect. The lattice is constituted by superimposition of a parity-time symmetric potential and an anti-parity-time symmetric potential with inconsistent frequencies. We find that the single gap solitons within semi-infinite bandgap can indeed stably persist, and their ss positions within the lattice can be precisely adjusted through controlling the oblique angles and propagation constants of incident solitons. Further study shows that the lattice enables dipole solitons with specific soliton energy to overcome inherent repulsion, facilitating their propagation within the lattice. This work unveils the existence of stable gap solitons supported by non-Hermitian moiré photonic lattices, emphasizing the pivotal roles of propagation constants and incident angles in regulating soliton propagation.