Higher order coherence of exciton-polariton condensates
Higher order coherence of exciton-polariton condensates
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DOI：
10.1103/physrevb.81.033307
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发表时间：
2010-01-01
影响因子：
3.7
通讯作者：
Yamamoto, Yoshihisa
中科院分区：
文献类型：
--
作者：
Horikiri, Tomoyuki;Schwendimann, Paolo;Yamamoto, Yoshihisa
测量了激子-极化子凝聚体的二阶和三阶相干函数g((n))(0) (n= 2和3)，并与理论进行了比较。与理想的光子激光器相反，在二阶和三阶相干函数中观察到偏离单位，从而显示出聚束效应，但不具有g((n))(0) = n!的标准热态特性。随着相干函数g((3))(0) > g((2))(0) > 1的阶数的增加，聚束的增加表明极化子凝聚体不同于相干态、数态或热态。与二阶相干相比，三阶相干的测量有一个优势，即热态和相干态之间的差异更加明显。实验结果与理论模型一致，其中极化-极化和极化-声子相互作用是造成时间相干性损失的原因。
The second- and third-order coherence functions g((n))(0) (n= 2 and 3) of an exciton-polariton condensate are measured and compared to the theory. Contrary to an ideal photon laser, deviation from unity in the second- and third-order coherence functions is observed, thus showing a bunching effect, but not the characteristics of a standard thermal state with g((n))(0) = n!. The increase in bunching with the order of the coherence function, g((3))(0) > g((2))(0) > 1, indicates that the polariton condensate is different from a coherent state, a number state, or a thermal state. The measurement of third-order coherence has the advantage, compared to the second-order one, that the difference between a thermal state and a coherent state is more pronounced. The experimental results are in agreement with the theoretical model where polariton-polariton and polariton-phonon interactions are responsible for the loss of temporal coherence.