Transition from Propagating Polariton Solitons to a Standing Wave Condensate Induced by Interactions
Transition from Propagating Polariton Solitons to a Standing Wave Condensate Induced by Interactions
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DOI：
10.1103/physrevlett.120.167402
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发表时间：
2018-04-19
影响因子：
8.6
通讯作者：
Krizhanovskii, D. N.
中科院分区：
文献类型：
--
作者：
Sich, M.;Chana, J. K.;Krizhanovskii, D. N.
在非线性极化子相互作用的介导下，我们研究了多模微线系统中极化子波包的相变，首先是到孤子，然后到驻波极化子凝聚。在低激发密度下，我们观察到由不同横模之间的干涉引起的多模极化子波包的弹道传播。随着激发密度的增加，由于模间和模内极化子-极化子散射的作用，波包转变为单模亮孤子。激发密度的进一步增加增加了热化速度，导致极化子密度从动量空间中的孤子谱分布松弛到低动量分布，从而形成非平衡凝聚，表现为整个样品的驻波模式。
We explore phase transitions of polariton wave packets, first, to a soliton and then to a standing wave polariton condensate in a multimode microwire system, mediated by nonlinear polariton interactions. At low excitation density, we observe ballistic propagation of the multimode polariton wave packets arising from the interference between different transverse modes. With increasing excitation density, the wave packets transform into single-mode bright solitons due to effects of both intermodal and intramodal polariton-polariton scattering. Further increase of the excitation density increases thermalization speed, leading to relaxation of the polariton density from a solitonic spectrum distribution in momentum space down to low momenta, with the resultant formation of a nonequilibrium condensate manifested by a standing wave pattern across the whole sample.