Formation of an exciton polariton condensate:: Thermodynamic versus kinetic regimes
Formation of an exciton polariton condensate:: Thermodynamic versus kinetic regimes
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DOI：
10.1103/physrevlett.101.146404
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发表时间：
2008-10-03
影响因子：
8.6
通讯作者：
Malpuech, G.
中科院分区：
文献类型：
--
作者：
Kasprzak, J.;Solnyshkov, D. D.;Malpuech, G.
测量了非共振泵浦下CdTe微腔中极化激元分布函数和凝聚阈值随光子-激子失谐量和晶格温度的变化。使用半经典玻尔兹曼方程的模拟结果再现。在负失谐，我们发现一个动力学凝聚制度：分布不是热的阈值是由弛豫动力学。在正失谐时，分布变为热的，并且阈值由系统的热力学参数决定。这两种制度都是极化激元激光的表现，而只有后者与被定义为平衡相变的玻色-爱因斯坦凝聚有关。
We measure the polariton distribution function and the condensation threshold versus the photon-exciton detuning and the lattice temperature in a CdTe microcavity under nonresonant pumping. The results are reproduced by simulations using semiclassical Boltzmann equations. At negative detuning we find a kinetic condensation regime: the distribution is not thermal and the threshold is governed by the relaxation kinetics. At positive detuning, the distribution becomes thermal and the threshold is governed by the thermodynamic parameters of the system. Both regimes are a manifestation of polariton lasing, whereas only the latter is related to Bose-Einstein condensation defined as an equilibrium phase transition.