Boundary effects on the dynamics of exciton polaritons in semiconductor microcavities
Boundary effects on the dynamics of exciton polaritons in semiconductor microcavities
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DOI：
10.1063/1.3075908
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发表时间：
2009-02
影响因子：
3.2
通讯作者：
Yongyou Zhang;G. Jin;Yu-qiang Ma
中科院分区：
文献类型：
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作者：
Yongyou Zhang;G. Jin;Yu-qiang Ma
利用耦合的Gross-Pitaevskii方程，研究了外加垂直泵浦光场激发的半导体微腔中激子极化子动力学的边界效应。当高斯泵浦场的半径远大于某一临界值时，半导体微腔的边界将大大增强极化激子-极化激子散射的各向异性，因此极化激元-极化激子散射的极化相关性可以忽略不计。此外，通过引入固定的边界条件，可以避免极化激子-极化激子散射中各向异性的泵浦阈值行为。在低激发区，这种各向异性的增强可以用来产生一对近乎强度对称的关联极化子，而这种效应更容易通过面积较小的方形微腔来实现。
Using the coupled Gross–Pitaevskii equations, we investigate the boundary effects on the dynamics of exciton polaritons in semiconductor microcavities excited by an applied vertical pump field. As the radius of the Gaussian pump field is far larger than a critical value, the boundaries of semiconductor microcavities will strongly enhance the anisotropy of the polariton-polariton scattering, and thus the polarization dependence of the polariton-polariton scattering can be neglected. Moreover, the pump threshold behavior of the anisotropy in the polariton-polariton scattering can be avoided by introducing fixed boundary conditions. In the low excitation regime, such an enhancement of anisotropy can be used to generate a pair of nearly intensity-symmetric correlated polaritons, and this efficacy can be more easily achieved by using square microcavities with small area.