极化激元凝聚体的振幅模动力学
Amplitude-mode dynamics of polariton condensates
摘要：
研究了非平衡极化激元凝聚体中集体振幅激发的稳定性。这些激发对应于重整化的上极化激元和原子气体和超导体的集体振幅模式。它们将在量子猝灭之后出现，或者可以通过共振激发直接产生。我们发现，均匀振幅的激发是不稳定的，在有限波矢的激发的生产，导致密度调制相位的形成。引起不稳定性的物理过程可以通过类比光学参量振荡器和原子玻色超新星来理解。
英文摘要：
We study the stability of collective amplitude excitations in non-equilibrium polariton condensates. These excitations correspond to renormalized upper polaritons and to the collective amplitude modes of atomic gases and superconductors. They would be present following a quantum quench or could be created directly by resonant excitation. We show that uniform amplitude excitations are unstable to the production of excitations at finite wavevectors, leading to the formation of density-modulated phases. The physical processes causing the instabilities can be understood by analogy to optical parametric oscillators and the atomic Bose supernova.
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