Gap solitons in parity-time-symmetric lattices with fractional-order diffraction

Gap solitons in parity-time-symmetric lattices with fractional-order diffraction
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具有分数阶衍射的宇称时间对称晶格中的间隙孤子

DOI:
10.1364/josab.376975
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发表时间:
2020-02
影响因子:
1.9
通讯作者:
Luo Xiao-Bing
Luo Xiao-Bing
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Li Lei;Li Hua-Gang;Ruan Wen;Leng Feng-Chun;Luo Xiao-Bing

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研究了分数阶衍射周期宇称对称晶格中的新型间隙孤子。讨论了第一和第二带隙中的基孤子和偶极孤子。研究发现,分数阶衍射不仅可以稳定聚焦非线性下第一间隙中的低功率偶极PT孤子,而且可以在散焦非线性下稳定第二间隙中的偶极PT孤子。此外,还分析了增益损耗分量的强度wi对孤子特性的影响。结果表明,增大${w_i}$wi不利于分数阶基孤子的稳定性,特别是对于第二带隙,而对于分数阶偶极孤子,增大${w_i}$wi可能导致其在第一带隙中失稳,而在第二带隙中稳定.
We investigate new types of gap solitons in a periodic parity-time (PT)-symmetric lattice with fractional-order diffraction. Both the fundamental and dipole solitons in the first and second gaps are discussed. It is found that fractional-order diffraction can not only stabilize low-power dipole PT solitons in the first gap under focusing nonlinearity, but also help to get stable dipole PT solitons in the second gap under defocusing nonlinearity. Additionally, the influence of the strength ${w_i}$wi of the gain–loss component on the properties of solitons is also analyzed. It is shown that increasing ${w_i}$wi is unfavorable to the stability of fractional fundamental solitons, especially for the second gap, while for fractional dipole solitons, the increase of ${w_i}$wi may lead to their destabilization in the first gap, but stabilization in the second gap.
具有克尔型非线性的空间分数阶薛定谔方程中的光孤子、自聚焦和波塌陷
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