This research is a study of the photon radiation from the bilayer graphene perturbed by the electromagnetic field. Theoretically, our simulation shows vividly the asymmetry property of such bilayer graphene resulting in the outstanding attribute of the photon emission profiles. The methods employed in our work are a tight-binding model in the many-body system and Fermi’s golden rule. In this work, we show the emission profiles in various kinds such as the single-photon emission (both in linear polarization and circular polarization) and the double photon emission. Additionally, in the case of double photon emission, we illustrate the degree of entanglement between photon pairs by analyzing the certain coincident rate involved indirectly in the emission profiles. The results demonstrate that the degree of entanglement is maximum when the photon pair’s direction is perpendicular to each other (especially, in the case that one of the photons emits in the direction being perpendicular to the bilayer graphene plane). We also discover that the direction of the maximum entangled photons depends on the polarization between the photon’s pairs.

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双层石墨烯单双光子发射特性的物理研究

这项研究是对电磁场扰动的双层石墨烯的光子辐射的研究。从理论上讲，我们的模拟生动地显示了这种双层石墨烯的不对称特性，导致光子发射曲线的突出属性。我们工作中采用的方法是多体系统和费米黄金法则中的紧束缚模型。在这项工作中，我们展示了各种类型的发射剖面，例如单光子发射（线性偏振和圆偏振）和双光子发射。此外，在双光子发射的情况下，我们通过分析发射剖面中间接涉及的某些重合率来说明光子对之间的纠缠程度。结果表明，当光子对的方向相互垂直时，纠缠度最大（特别是在一个光子在垂直于双层石墨烯平面的方向上发射的情况下）。我们还发现最大纠缠光子的方向取决于光子对之间的极化。