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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Faraday-rotation spectrum of electron spins in microcavity-embedded GaAs quantum wells
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Faraday-rotation spectrum of electron spins in microcavity-embedded GaAs quantum wells

机译：微腔嵌入GaAs量子阱中电子自旋的法拉第旋转光谱

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摘要

Using the time-resolved magneto-optical Faraday effect, the dynamics of electron spins is measured in a GaAs quantum well embedded in a vertical one-dimensional optical cavity. The cavity leads to an enhancement of the Faraday-rotation amplitude that varies with the detuning between the QW absorption peak and the cavity resonance. We find a transition in the Faraday rotation spectrum that is triggered by the cavity detuning. This is attributed to a modification of the phase of the cavity reflectivity at the impedance-matching condition of the cavity. If the QW absorption is too small to compensate the asymmetry of the cavity mirrors, the Faraday-rotation signal is dominated by spin-induced circular birefringence, whereas contributions from circular dichroism predominate for higher quantum-well absorption. A numerical calculation of the Faraday-rotation spectrum is in good agreement with the experimental results.
机译：使用时间分辨的磁光法拉第效应，在嵌入垂直一维光学腔中的GaAs量子阱中测量电子自旋的动力学。腔导致法拉第旋转幅度的增加，该幅度随QW吸收峰和腔共振之间的失谐而变化。我们发现法拉第旋转光谱中的一个跃迁是由谐振腔失谐触发的。这归因于在腔的阻抗匹配条件下腔反射率的相位的改变。如果QW吸收太小而不能补偿腔镜的不对称性，则法拉第旋转信号由自旋诱导的圆双折射主导，而圆二色性的贡献则占较高的量子阱吸收。法拉第旋转光谱的数值计算与实验结果吻合良好。

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