arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.02771cond-mat.mes-hall
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自感拉莫尔旋进的自旋噪声特征

Spin noise signatures of the self-induced Larmor precession

I. I. Ryzhov, V. O. Kozlov, N. S. Kuznetsov, I. Yu. Chestnov, A. V. Kavokin, A. Tzimis, Z. Hatzopoulos, P. G. Savvidis, G. G. Kozlov, V. S. Zapasskii

摘要:

激子-极化激元的玻色-爱因斯坦凝聚体以其迷人的相干和极化特性而闻名。凝聚体的自旋状态反映在激子-极化激元发射的偏振中,该偏振的时间波动通常能够反映凝聚体中极化激元的量子统计。为了研究光阱极化激元凝聚体的偏振特性,我们利用自旋噪声谱技术。发现凝结辐射的椭圆率噪声与其偏振面旋转噪声之间的比值以非平凡的方式依赖于CW非共振激光泵浦的强度。我们发现,椭圆率和旋转噪声之间的相互作用可以解释的凝聚体赝自旋的自诱导拉莫尔进动和静态极化各向异性的微腔之间的竞争。

英文摘要:

Bose-Einstein condensates of exciton-polaritons are known for their fascinating coherent and polarization properties. The spin state of the condensate is reflected in polarization of the exciton-polariton emission, with temporal fluctuations of this polarization being, in general, capable of reflecting quantum statistics of polaritons in the condensate. To study the polarization properties of optically trapped polariton condensates, we take advantage of the spin noise spectroscopy technique. The ratio between the noise of ellipticity of the condensate emission and its polarization plane rotation noise is found to be dependent, in a nontrivial way, on the intensity of CW nonresonant laser pumping. We show that the interplay between the ellipticity and the rotation noise can be explained in terms of the competition between the self-induced Larmor precession of the condensate pseudospin and the static polarization anisotropy of the microcavity.

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