Noise at a Fermi-edge singularity

TL;DR

This paper investigates noise characteristics in InAs quantum dots under high magnetic fields, revealing how Fermi-edge singularities influence current and shot noise, highlighting electron-electron interactions.

Contribution

It provides the first detailed noise analysis of Fermi-edge singularities in quantum dots at high magnetic fields, linking noise suppression to electron interactions.

Findings

Current overshoot due to Fermi-edge singularity

Enhanced shot noise suppression observed

Electron-electron interactions affect noise behavior

Abstract

We present noise measurements of self-assembled InAs quantum dots at high magnetic fields. In comparison to I-V characteristics at zero magnetic field we notice a strong current overshoot which is due to a Fermi-edge singularity. We observe an enhanced suppression in the shot noise power simultaneous to the current overshoot which is attributed to the electron-electron interaction in the Fermi-edge singularity.