Tunable Kondo-Luttinger systems far from equilibrium

TL;DR

This paper develops a theoretical framework to analyze non-equilibrium current in quantum dots with one-dimensional leads, revealing how strong interactions and bias voltages influence conductance and Kondo physics.

Contribution

It introduces a controlled frequency-dependent RG approach to study non-equilibrium transport in Kondo-Luttinger systems, highlighting the effects of bias and interactions.

Findings

Large bias voltage modifies conductance in Kondo-Luttinger systems.

Strong interactions can stabilize two-channel Kondo physics.

Analogy to topological insulator edge states for weak interactions.

Abstract

We theoretically investigate the non-equilibrium current through a quantum dot coupled to one- dimensional electron leads, utilizing a controlled frequency-dependent renormalization group (RG) approach. We compute the non-equilibrium conductance for large bias voltages and address the interplay between decoherence, Kondo entanglement and Luttinger physics. The combined effect of large bias voltage and strong interactions in the leads, known to stabilize two-channel Kondo physics, leads to non-trivial modifications of the conductance. For weak interactions, we build an analogy to a dot coupled to helical edge states of two-dimensional topological insulators.