The non-symmetrized current noise is crucial for the analysis of light emission in nanojunctions. The latter represent non-classical photon emitters whose description requires a full quantum approach. It was found experimentally that light emission can occur with a photon energy exceeding the applied dc voltage, which intuitively should be forbidden due to the Pauli principle. This overbias light emission cannot be described by the single-electron physics, but can be explained by two-electron or even three-electron processes, correlated by a local resonant mode in analogy to the well-known dynamical Coulomb blockade (DCB). Here, we obtain the non-symmetrized noise for junctions driven by an arbitrarily shaped periodic voltage. We find that when the junction is driven, the overbias light emission exhibits intriguingly different features compared to the dc case. In addition to kinks at multiples of the bias voltage, side kinks appear at integer multiples of the ac driving frequency. Our work generalizes the DCB theory of light emission to driven tunnel junctions and opens the avenue for engineered quantum light sources, which can be tuned purely by applied voltages.

中文翻译：

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交流驱动隧道结的非经典电流噪声和光发射

非对称电流噪声对于纳米结中的光发射分析至关重要。后者代表非经典光子发射器，其描述需要全量子方法。实验发现，当光子能量超过施加的直流电压时，会发生光发射，由于泡利原理，这在直觉上应该被禁止。这种过偏光发射不能用单电子物理学来描述，但可以用两电子甚至三电子过程来解释，通过类似于众所周知的动态库仑阻塞 (DCB) 的局部谐振模式相关联。在这里，我们获得了由任意形状的周期性电压驱动的结的非对称噪声。我们发现当路口被驱动时，与直流情况相比，过偏光发射表现出有趣的不同特征。除了在偏置电压的倍数处出现扭结外，侧面扭结出现在交流驱动频率的整数倍处。我们的工作将光发射的 DCB 理论推广到驱动隧道结，并为工程量子光源开辟了道路，量子光源可以完全通过施加的电压进行调整。