Parmentier F D, Serkovic-Loli L N, Roulleau P, Glattli D C
SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay 91191 Gif-sur-Yvette cedex, France.
Phys Rev Lett. 2016 Jun 3;116(22):227401. doi: 10.1103/PhysRevLett.116.227401. Epub 2016 Jun 2.
When subjected to electromagnetic radiation, the fluctuation of the electronic current across a quantum conductor increases. This additional noise, called photon-assisted shot noise, arises from the generation and subsequent partition of electron-hole pairs in the conductor. The physics of photon-assisted shot noise has been thoroughly investigated at microwave frequencies up to 20 GHz, and its robustness suggests that it could be extended to the terahertz (THz) range. Here, we present measurements of the quantum shot noise generated in a graphene nanoribbon subjected to a THz radiation. Our results show signatures of photon-assisted shot noise, further demonstrating that hallmark time-dependant quantum transport phenomena can be transposed to the THz range.
当受到电磁辐射时，量子导体中电子电流的波动会增加。这种额外的噪声，称为光子辅助散粒噪声，源于导体中电子 - 空穴对的产生及其后续的分配。在高达20 GHz的微波频率下，光子辅助散粒噪声的物理特性已得到充分研究，其稳健性表明它可以扩展到太赫兹（THz）范围。在此，我们展示了在受到太赫兹辐射的石墨烯纳米带中产生的量子散粒噪声的测量结果。我们的结果显示出光子辅助散粒噪声的特征，进一步证明了具有标志性的时间相关量子输运现象可以转换到太赫兹范围。
