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arXiv 1811.02460nlin.PS
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PT对称非线性周期势场中的非局域间隙孤子

Nonlocal gap solitons in PT-symmetric periodic potentials with defocusing nonlinearity

Chandroth P. Jisha, Alessandro Alberucci, Valeriy A. Brazhnyi, Gaetano Assanto

摘要:

从理论和数值计算两方面研究了具有散焦非局域非线性的周期结构中PT对称间隙孤子的存在性和稳定性。我们发现,对于任何程度的非局域性,间隙孤子总是不稳定的虚势的存在。这种不稳定性表现为粒子流不平衡引起的孤子横向漂移。我们还证明了微扰增长率与增益(损失)量成正比,从而预测了小虚势下稳定间隙孤子的可观测性。

英文摘要:

Existence and stability of PT-symmetric gap solitons in a periodic structure with defocusing nonlocal nonlinearity are studied both theoretically and numerically. We find that, for any degree of nonlocality, gap solitons are always unstable in the presence of an imaginary potential. The instability manifests itself as a lateral drift of solitons due to an unbalanced particle flux. We also demonstrate that the perturbation growth rate is proportional to the amount of gain (loss), thus predicting the observability of stable gap solitons for small imaginary potentials.

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