Floquet Renormalization Group Approach to the Periodically Driven Kondo Model

TL;DR

This paper introduces a Floquet renormalization group method to analyze the driven Kondo model, revealing persistent Kondo resonances under periodic driving and emphasizing the importance of non-Markovian effects for accurate modeling.

Contribution

The study develops a novel Floquet renormalization group approach that captures the complex interplay of strong correlations and periodic driving in the Kondo model, surpassing simpler models.

Findings

Emergence of side-replicas of the Kondo resonance in conductance.

Good quantitative agreement with experimental data across driving regimes.

Identification of non-Markovian memory effects influencing decoherence.

Abstract

We study the interplay of strong correlations and coherent driving by considering the strong-coupling Kondo model driven by a time-periodic bias voltage. Combining a recent nonequilibrium renormalization group method with Floquet theory, we find that by the coherent dressing of the driving field side-replicas of the Kondo resonance emerge in the conductance, which are not completely washed out by the decoherence induced by the driving. We show that to accurately capture the interplay of driving and strong correlations one needs to go beyond simple phenomenological pictures, which underestimate decoherence, or adiabatic approximations, highlighting the relevance of non-Markovian memory effects. Within our method the differential conductance shows good quantitative agreement with experimental data in the full crossover regime from weak to strong driving. We analyze memory effects in detail based on the response to short voltage pulses.