# Fermi edge singularities in transport through lateral GaAs quantum dots

## TL;DR

This paper reports on the observation of Fermi edge singularities in tunneling currents through GaAs quantum dots, demonstrating how barrier tuning affects many-body interactions at the quantum level.

## Contribution

It provides experimental evidence of Fermi edge singularities in quantum dot transport and shows how tunneling barrier adjustments influence many-body effects.

## Key findings

- Resonance linked to Fermi edge singularity observed at specific barrier configurations
- Tuning barrier strength modifies the interaction between localized electrons and the Fermi sea
- Many-body scattering effects are evident in tunneling current measurements

## Abstract

We measure tunnelling currents through electrostatically defined quantum dots in a GaAs/AlGaAs heterostructure connected to two leads. For certain tunnelling barrier configurations and high sample bias we find a pronounced resonance associated with a Fermi edge singularity. This many-body scattering effect appears when the electrochemical potential of the quantum dot is aligned with the Fermi level of the lead less coupled to the dot. By changing the relative tunnelling barrier strength we are able to tune the interaction of the localised electron with the Fermi sea.