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arXiv 1905.05855cond-mat.quant-gasnlin.PS
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共振驱动极化激元流体中超流性的新观点

New perspectives on superfluidity in resonantly--driven polariton fluids

Ivan Amelio, Iacopo Carusotto

摘要:

在本文中,我们讨论的格罗斯-Pitaevskii框架内,超流性,孤子成核,和不稳定性的非平衡极化激元流体注入的空间局部化和连续波相干泵和流动对缺陷位于泵点之外。与平衡凝聚体相反,在这种特定的几何形状的驱动耗散方程的稳态解几乎没有显示出一个干净的超流周围的缺陷,而是具有从浅到深的孤子般的扰动的交叉。这是解释的一维流动的性质,特别是他们的弱依赖于泵的参数和他们的快速过渡到一个超声波制度下的量子压力的影响;这样一个高度非线性的行为要求定量实验测试的基本格罗斯-Pitaevskii方程。无序和不连贯的水库在诱导非平稳行为与移动的涡流的作用也突出显示。

英文摘要:

In this paper we discuss, within the Gross--Pitaevskii framework, superfluidity, soliton nucleation, and instabilities in a non-equilibrium polariton fluid injected by a spatially localized and continuous-wave coherent pump and flowing against a defect located outside the pump spot. In contrast to equilibrium condensates, the steady-state solutions of the driven-dissipative equations in this specific geometry hardly show a clean superfluid flow around the defect and rather feature a crossover from shallow to deep soliton-like perturbation. This is explained in terms of the properties of one-dimensional flows, in particular their weak dependence on the pump parameters and their rapid transition to a super-sonic regime under the effect of the quantum pressure; such a highly nonlinear behaviour calls for quantitative experimental tests of the underlying Gross--Pitaevskii equation. The role of disorder and of a incoherent reservoir in inducing non-stationary behaviours with moving vortices is also highlighted.

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