Shot Noise in SU(N) Quantum Dot Kondo Effects

TL;DR

This paper investigates shot noise in SU(N) Kondo quantum dots, especially N=4, revealing how interactions influence noise and offering experimental predictions.

Contribution

It provides a detailed analysis of how two-particle Fermi liquid interactions affect shot noise in SU(N) Kondo systems, highlighting differences for N=4.

Findings

Interactions can enhance shot noise via back-scattering with an N-dependent charge

Interactions modify partition noise even without back-scattering

For N=4, interactions enhance noise mainly through partition noise

Abstract

We study shot noise in the current of quantum dots whose low-energy behaviour corresponds to an SU(N) Kondo model, focusing on the case N=4 relevant to carbon nanotube dots. For general N, two-particle Fermi liquid interactions have two distinct effects: they can enhance the noise via back-scattering processes with an N-dependent effective charge, and can also modify the coherent partition noise already present without interactions. For N=4, in contrast to the SU(2) case, interactions enhance shot noise solely through an enhancement of partition noise. This leads to a non-trivial prediction for experiment.