Ground-state properties of microcavity polariton condensates at arbitrary excitation density
Ground-state properties of microcavity polariton condensates at arbitrary excitation density
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DOI：
10.1103/physrevb.83.165319
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发表时间：
2011-04
影响因子：
3.7
通讯作者：
K. Kamide;T. Ogawa
中科院分区：
文献类型：
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作者：
K. Kamide;T. Ogawa
微腔极化激元玻色-爱因斯坦凝聚（BEC）的基态被确定为实验可调参数（激发密度和腔光子的失谐量）的函数，也被确定为材料参数（紫外截止）的函数。为了得到任意激发密度下的基态，将一种计算激子绝缘体BEC-BCS交叉的插值方法推广到二维或三维微腔极化激元系统.随着激发密度的增加，凝聚体的基态从激子态变为光子态。这种变化是伴随着几个有趣的功能：（一）激光类输入（激发密度）和输出（光子密度）的关系与急剧的大失谐系统的开始，它的变化与轻微失谐系统的平滑开始。(ii)电子-空穴对的结合力的起源从库仑吸引力转变为光子介导的相互作用，导致在光子体系中形成具有小半径的强结合对，例如Frenkel激子。基态的变化可以是一个交叉或一阶跃迁，这取决于上述参数，并通过绘制相图进行研究。
The ground state of microcavity polariton Bose-Einstein condensates (BEC's) is determined as a function of experimentally tunable parameters (the excitation density and the detuning of cavity photons), and also a material parameter (the ultraviolet cutoff). To obtain the ground state at an arbitrary excitation density, an interpolation method for the BEC-BCS crossover of excitonic insulators is extended to microcavity polariton systems in two or three dimensions. The ground state of the condensate changes from excitonic to photonic with an increase in the excitation density. This change is accompanied by several interesting features: (i) A laserlike input (excitation density) and output (photon density) relation with a sharp onset for largely detuned systems, which changes to that with a smooth onset for slightly detuned systems. (ii) The origin of the binding force of electron-hole pairs changes from Coulomb attraction to photon-mediated interactions, resulting in the formation of strongly bound pairs with a small radius, such as Frenkel excitons, in the photonic regime. The change in the ground state can be a crossover or a first-order transition, depending on the above-mentioned parameters, and is studied by plotting phase diagrams.