论文标题
磁场受控光子回波带来的长生长的深色连贯性
Long-living dark coherence brought to light by magnetic-field controlled photon echo
论文作者
论文摘要
横向磁场上的准粒子旋转旋转导致自发光子回声信号的振荡，这是由于光学上可访问（明亮）和无法访问（黑暗）状态之间的光学相干性的改组。在这里，我们报告了在存在明亮和黑暗状态的非平等降低速率的情况下观察到的新的非振荡光子回声制度。该机制可以观察到悠久的深色光学连贯性。作为一个简单的机械类比，我们建议通过各向异性粘性摩擦在磁场中移动的带电粒子。我们证明了从Ingaas/Gaas量子井中的激子自发的光子回波中的深色连贯检索。
Larmor precession of the quasiparticle spin about a transverse magnetic field leads to the oscillations in the spontaneous photon echo signal due to the shuffling of the optical coherence between optically accessible (bright) and inaccessible (dark) states. Here we report on a new non-oscillating photon echo regime observed in the presence of non-equal dephasing rates of bright and dark states. This regime enables the observation of the long-living dark optical coherence. As a simple mechanical analogy, we suggest a charged particle moving in the magnetic field through the medium with anisotropic viscous friction. We demonstrate the dark coherence retrieval in the spontaneous photon echo from excitons in the InGaAs/GaAs quantum well.
