论文标题
从自我诱导的Larmor propession中旋转旋转的旋转旋晶的相干复兴
Coherence Revivals of a Spinor Polariton Condensate from Self-induced Larmor Precession
论文作者
论文摘要
偏光基冷凝物的一阶相干测量揭示了一个机制，其中冷凝物伪旋转在驱动光脉冲中持续持续进行。在单个20 $μ$ S光学脉冲中，冷凝器伪旋转的性能超过$ 10^5 $，具有惊人的频率稳定性。即使在对自旋矢量进行完全进攻之后，冷凝物仍保持其相干性，从而使观察到的状态通过定义为自旋相干状态。进动的出现可追溯到北极星的相互作用，从而导致一个自我诱导的平面磁场，从而驱动了自旋动力学。我们发现Larmor振荡频率尺度具有冷凝水密度，可以通过光学手段对此效果进行外部调整。该系统的稳定性允许使用具有增强的激子$ G $ factor的材料来实现集成的光学磁力测定设备，并可以促进旋转挤压效果和对Polariton冷凝物中Bloch球体的主动相干控制。
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.
