Photon-assisted shot noise in graphene in the Terahertz range

TL;DR

This paper reports the first measurements of photon-assisted shot noise in graphene nanoribbons under Terahertz radiation, demonstrating the extension of quantum transport phenomena into the THz frequency range.

Contribution

It provides experimental evidence of photon-assisted shot noise in graphene at THz frequencies, expanding understanding of quantum noise in high-frequency regimes.

Findings

Photon-assisted shot noise signatures observed in graphene nanoribbons.

Quantum transport phenomena can be extended to the Terahertz range.

Demonstrates robustness of photon-assisted shot noise at high frequencies.

Abstract

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.