Non-equilibrium conductance of a three-terminal quantum dot in the Kondo regime: Perturbative Renormalization Group

TL;DR

This paper investigates the non-equilibrium conductance of a three-terminal quantum dot in the Kondo regime, using perturbative renormalization group to analyze how bias voltages and lead coupling anisotropy affect the Kondo resonance and decoherence.

Contribution

It introduces a perturbative renormalization group approach to study the conductance and Kondo resonance splitting in a three-terminal quantum dot under large bias voltages.

Findings

Conductance in three-terminal devices is sensitive to decoherence effects.

Bias voltages and coupling anisotropy influence the Kondo resonance splitting.

Decoherence rate is governed by current-induced effects in the system.

Abstract

Motivated by recent experiments, we consider a single-electron transistor in the Kondo regime which is coupled to three leads in the presence of large bias voltages. Such a steady-state non-equilibrium system is to a large extent governed by a decoherence rate induced by the current through the dot. As the two-terminal conductance turns out to be rather insensitive to the decoherence rate, we study the conductance in a three-terminal device using perturbative renormalization group and calculate the characteristic splitting of the Kondo resonance. The interplay between potential biases and anisotropy in coupling to the three leads determines the decoherence rate and the conditions for strong coupling.