非共振泵浦极化激元凝聚体激发谱的探讨
Probing the excitation spectrum of nonresonantly pumped polariton condensates
摘要：
我们提出了一个四波混频实验来探测激子-极化激元的非平衡玻色-爱因斯坦凝聚体在非共振泵浦下的元激发谱。基于平均场论的分析计算表明，该方法能够揭示Bogoliubov色散的特征负能量特征。数值模拟，包括有限的空间分布的激发激光光斑和弱无序证实了实用实用的方法为现实的凝聚。
英文摘要：
We propose a four wave mixing experiment to probe the elementary excitation spectrum of a non-equilibrium Bose-Einstein condensate of exciton-polaritons under non-resonant pumping. Analytical calculations based on mean-field theory show that this method is able to reveal the characteristic negative energy feature of the Bogoliubov dispersion. Numerical simulations including the finite spatial profile of the excitation laser spot and a weak disorder confirm the practical utility of the method for realistic condensates.
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