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arXiv 1905.04098cond-mat.mes-hallphysics.optics
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量子化电导率对原子尺度点接触辐射反常光子发射的影响

Effect of quantized conductivity on the anomalous photon emission radiated from atomic-size point contacts

Mickaël Buret, Igor V. Smetanin, Alexander V. Uskov, Gérard Colas des Francs, Alexandre Bouhelier

摘要:

我们观察到异常可见近红外电磁辐射从电驱动的原子大小的点接触发射。我们发现,释放的光子数强烈依赖于量子化的接触电导步骤。与直觉相反,光强度具有与注入的电功率的指数衰减依赖性。我们提出了一个分析模型的光发射考虑一个平衡电子分布。我们把光子发射看作是热电子与金属边界碰撞产生的韧致辐射过程,得到了与实验定性一致的结果。

英文摘要:

We observe anomalous visible to near-infrared electromagnetic radiation emitted from electrically driven atomic-size point contacts. We show that the number of photons released strongly depends on the quantized conductance steps of the contact. Counter-intuitively, the light intensity features an exponential decay dependence with the injected electrical power. We propose an analytical model for the light emission considering an out-of-equilibrium electron distribution. We treat photon emission as bremsstrahlung process resulting from hot electrons colliding with the metal boundary and a find qualitative accord with the experimental data.

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