锗的光学可重构偏振发射
Optically reconfigurable polarized emission in Germanium
摘要：
光的偏振可以方便地对信息进行编码。然而，控制偏振光场的能力非常苛刻，但对于开发实用的数据加密方法和收集光物质相互作用的基本见解至关重要。在这里，我们展示了在电信波长制度的光的手征性的动态操纵。这种独特的可能性植根于传统半导体（即Ge）导带的多通道性质。特别是，我们证明了光泵浦足以控制自旋极化载流子的动力学，并最终手性的辐射复合。我们发现，在没有磁场控制或相移耦合的情况下，光跃迁的偏振可以显著地扫过正交本征态。我们的研究结果预计自旋增强的光电功能的主流微电子工业的支持下的材料，并提供指导信息的选择和设计的功能化的发射体的基础上，新的IV族化合物。
英文摘要：
Light polarization can conveniently encode information. Yet, the ability to steer polarized optical fields is notably demanding but crucial to develop practical methods for data encryption and to gather fundamental insights into light-matter interactions. Here we demonstrate the dynamic manipulation of the chirality of light in the telecom wavelength regime. This unique possibility is enrooted in the multivalley nature of the conduction band of a conventional semiconductor, namely Ge. In particular, we demonstrate that optical pumping suffices to govern the kinetics of spin-polarized carriers and eventually the chirality of the radiative recombination. We found that the polarization of the optical transitions can be remarkably swept through orthogonal eigenstates without magnetic field control or phase shifter coupling. Our results anticipate spin-enhanced optoelectronic functionalities in materials backed by the mainstream microelectronics industry and provide guiding information for the selection and design of functionalized emitters based on novel group IV compounds.
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