Defect solitons in parity-time symmetric superlattices.
Defect solitons in parity-time symmetric superlattices.
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DOI：
10.1364/oe.19.011457
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发表时间：
2011-06
期刊：
影响因子：
3.8
通讯作者：
Zhien Lu;Zhi-Ming Zhang
中科院分区：
文献类型：
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作者：
Zhien Lu;Zhi-Ming Zhang
研究了具有聚焦克尔非线性的宇称时间(PT)对称超晶格中的缺陷孤子。具有PT对称势的DSS的性质明显不同于具有真实折射率的超晶格中的DSS。从PT对称性中可以发现不寻常的特征。研究结果表明，具有零缺陷或正缺陷的孤子可以在半无限大的空隙中稳定地传播，但不能在第一个空隙中存在。对于负缺陷情况，孤子可以稳定地存在于半无限带隙和第一带隙中。
We study defect solitons (DSs) in a parity-time (PT) symmetric superlattice with focusing Kerr nonlinearity. The properties of the DSs with a PT symmetrical potential are obviously different from those in a superlattice with a real refractive index. Unusual features stemming from PT symmetry can be found. Research results show that the solitons with a zero defect or a positive defect can exist and stably propagate in the semi-infinite gap, but they cannot exist in the first gap. For the case of a negative defect, the soliton can stably exist in both the semi-infinite gap and the first gap.