Many-body correlations in Floquet steady-states: Frequency-resolved renormalization group of the driven Anderson impurity
arXiv:2603.12844 · doi:10.1103/693m-tklt
The paper develops a functional renormalization group method for Floquet steady-states that keeps frequency-dependent interactions, and applies it to a periodically driven Anderson impurity to study nonequilibrium transport and the robustness of Kondo correlations under driving.
Abstract
We introduce a functional renormalization group framework formulated directly in the Floquet steady-state that systematically incorporates frequency-dependent interaction effects. By retaining the frequency structure of the two-particle vertex up to second order in interaction strength, our approach provides controlled access to dynamical response functions and nonequilibrium transport in driven, interacting systems. Using the periodically driven single-impurity Anderson model as a paradigmatic example, we benchmark our results against state-of-the-art Floquet Green's function methods and find quantitative agreement for finite-frequency observables up to intermediate interaction strengths. Remarkably, we also show that static properties are often captured reliably by much simpler approximations, suggesting practical pathways for modeling driven quantum materials. Finally, we demonstrate that although periodic driving of the dot strongly broadens the Kondo resonance through inelastic scattering, it leaves the many-body Kondo cloud largely intact. This robustness suppresses Floquet replicas of the Kondo peak and leads to a partial persistence of Kondo pinning, highlighting the resilience of emergent many-body correlations under local periodic driving.
20 pages, 8 figures