Polarization bistability and resultant spin rings in semiconductor microcavities.
Polarization bistability and resultant spin rings in semiconductor microcavities.
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DOI：
10.1103/physrevlett.105.216402
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发表时间：
2010-07
影响因子：
8.6
通讯作者：
Debojit Sarkar;S. Gavrilov;M. Sich;J. H. Quilter;R. Bradley;N. Gippius;K. Guda;V. Kulakovskii;M. S. Skolnick;D. Krizhanovskii
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文献类型：
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作者：
Debojit Sarkar;S. Gavrilov;M. Sich;J. H. Quilter;R. Bradley;N. Gippius;K. Guda;V. Kulakovskii;M. S. Skolnick;D. Krizhanovskii
与半导体微腔的下极化激元分支共振的泵浦激光的透射率高度依赖于泵浦的圆偏振度。极化激元-极化激元相互作用的自旋相关各向异性允许通过改变泵浦功率来控制内部极化。空间图案的形成，具有高度的圆偏振，所产生的极化双稳态的结果，自旋环，观察。一个唯象模型的基础上有效的半经典运动方程提供了一个很好的描述实验结果。包含与非相干激子库，它提供了自旋无关的极化激元模式的蓝移的相互作用，被认为是必不可少的。
The transmission of a pump laser resonant with the lower polariton branch of a semiconductor microcavity is shown to be highly dependent on the degree of circular polarization of the pump. Spin dependent anisotropy of polariton-polariton interactions allows the internal polarization to be controlled by varying the pump power. The formation of spatial patterns, spin rings with a high degree of circular polarization, arising as a result of polarization bistability, is observed. A phenomenological model based on effective semiclassical equations of motion provides a good description of the experimental results. Inclusion of interactions with the incoherent exciton reservoir, which provides spin-independent blueshifts of the polariton modes, is found to be essential.