非相干波中随机暗包络孤子的形成
Formation of Random Dark Envelope Solitons from Incoherent Waves
摘要:
本文报道了一种新型孤子:随机时间暗孤子的实验结果。在具有排斥性瞬时非线性的铁磁薄膜带中激发非相干大振幅自旋波包。然后观察到暗孤子从这个波包的随机形成。孤子在时间和相对于整个波包的位置上随机出现。它们可以是灰色或黑色。对于宽的和/或很强的自旋波包,我们也观察到多个暗孤子。尽管初始波包和随机形成过程的随机性,孤子显示出传统的相干暗孤子的签名。
英文摘要:
This letter reports experimental results on a new type of soliton: the random temporal dark soliton. One excites an incoherent large-amplitude propagating spin-wave packet in a ferromagnetic film strip with a repulsive, instantaneous nonlinearity. One then observes the random formation of dark solitons from this wave packet. The solitons appear randomly in time and in position relative to the entire wave packet. They can be gray or black. For wide and/or very strong spin-wave packets, one also observes multiple dark solitons. In spite of the randomness of the initial wave packets and the random formation processes, the solitons show signatures that are found for conventional coherent dark solitons.
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