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arXiv 2006.01741cond-mat.mes-hallcond-mat.quant-gas
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旋量极化子凝聚体自感Larmor旋进的相干恢复

Coherence Revivals of a Spinor Polariton Condensate from Self-induced Larmor Precession

Alexis Askitopoulos, Helgi Sigurdsson, Ivan Gnusov, Sergey Alyatkin, Lucy Pickup, Nikolay A. Gippius, Pavlos G. Lagoudakis

摘要:

一阶相干测量的极化激元凝聚体,揭示了一个制度,凝聚体的伪自旋进动持续内的驱动光脉冲。在单个20 $μ$ s光脉冲内,凝聚体赝自旋以惊人的频率稳定性在$10^5$进动上进行。凝聚体即使在自旋矢量完全进动之后也保持其相位相干性,使得通过定义观察到的状态成为自旋相干态。旋进的出现可以追溯到极化激元相互作用,极化激元相互作用产生自感平面外磁场,进而驱动自旋动力学。我们发现,拉莫尔振荡频率与凝聚密度的比例,使外部调谐这种效果的光学手段。该系统的稳定性允许使用具有增强的激子$g$因子的材料来实现集成光学磁力测量设备,并且可以促进极化激元凝聚物中的布洛赫球上的自旋压缩效应和主动相干控制。

英文摘要:

First order coherence measurements of a polariton condensate, reveal a regime where the condensate pseudo-spin precesses persistently within the driving optical pulse. Within a single 20 $μ$s optical pulse the condensate pseudo-spin performs over $10^5$ precessions with striking frequency stability. The condensate maintains its phase coherence even after a complete precession of the spin vector, making the observed state by a definition a spin coherent state. The emergence of the precession is traced to the polariton interactions that give rise to a self-induced out-of-plane magnetic field that in turn drives the spin dynamics. We find that the Larmor oscillation frequency scales with the condensate density, enabling external tuning of this effect by optical means. The stability of the system allows for the realization of integrated optical magnetometry devices with the use of materials with enhanced exciton $g$-factor and can facilitate spin squeezing effects and active coherent control on the Bloch sphere in polariton condensates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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