Nonequilibrium shot noise spectrum through a quantum dot in the Kondo regime: A master equation approach under self-consistent Born approximation

TL;DR

This paper introduces a non-Markovian, self-consistent master equation approach to calculate shot noise spectra in quantum dots, revealing significant nonequilibrium Kondo signatures under small bias voltages.

Contribution

It develops a novel n-resolved master equation under SCBA that captures multi-tunneling and many-body effects beyond traditional methods.

Findings

Predicts a strong nonequilibrium Kondo signature in shot noise spectrum.

Demonstrates applicability to non-Markovian regimes with strong Coulomb interactions.

Goes beyond Born-Markovian approaches for transport noise analysis.

Abstract

We construct a number($n$)-resolved master equation (ME) approach under self-consistent Born approximation (SCBA) for noise spectrum calculation. The formulation is essentially non-Markovian and incorporates properly the interlay of the multi-tunneling processes and many-body correlations. We apply this approach to the challenging nonequilibrium Kondo system and predict a profound nonequilibrium Kondo signature in the shot noise spectrum. The proposed $n$-SCBA-ME scheme goes completely beyond the scope of the Born-Markovian master equation approach, in the sense of being applicable to the shot noise of transport under small bias voltage, in non-Markovian regime, and with strong Coulomb correlations as favorably demonstrated in the nonequilibrium Kondo system.