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Nonlinear excitations, stability inversions, and dissipative dynamics in quasi-one-dimensional polariton condensates

机译:准一维极化子凝聚物中的非线性激发,稳定性反演和耗散动力学

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摘要

We study the existence, stability, and dynamics of the ground state and nonlinear excitations, in the form of dark solitons. for a quasi-one-dimensional polariton condensate in the presence of nonresonant pumping and nonlinear damping. We rind a series of remarkable features that can be directly contrasted to the case of the typically energy-conserving ultracold alkali-atom Bose-Einstein condensates. For some sizable parameter ranges, the nodeless ("ground") state becomes unstable toward the formation of stable nonlinear single- or multi-dark-soliton excitations. It is also observed that for suitable parametric choices, the instability of single dark solitons can nucleate multi-dark-soliton states. Also, for other parametric regions, stable asymmetric sawtooth-like solutions exist. These are shown to emerge through a symmetry-breaking bifurcation from bubble-like solutions that we also explore. We also consider the dragging of a defect through the condensate and the interference of two initially separated condensates, both of which are capable of nucleating dark multisoliton dynamical states.
机译:我们以暗孤子的形式研究基态和非线性激发的存在,稳定性和动力学。非共振泵浦和非线性阻尼作用下的准一维极化子冷凝物。我们清洗了一系列显着的特征,这些特征可以与典型的节能超冷碱原子玻色-爱因斯坦凝聚物形成对比。对于某些可观的参数范围,无节点(“基”)状态变得不稳定,难以形成稳定的非线性单暗孤子或多暗孤子激发。还观察到,对于合适的参数选择,单个暗孤子的不稳定性会成核多个暗孤子态。同样,对于其他参数区域,存在稳定的不对称锯齿状解。这些都表明是通过我们也探索过的类似气泡的解决方案的对称破坏分叉出现的。我们还考虑了缺陷通过凝结物的拖动以及两个最初分离的凝结物的干扰,这两种方法都能够使暗多孤子动力学状态成核。

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