The Anderson Model out of equilibrium: Time dependent perturbations

TL;DR

This paper investigates how high-frequency fields affect quantum transport in quantum dots, revealing photon-assisted tunneling, Kondo side peaks, and an electron-photon pump, thus advancing understanding of nonequilibrium Kondo phenomena.

Contribution

It extends the non crossing approximation for the Anderson model to include time-dependent perturbations, enabling analysis of high-frequency effects on quantum dot transport.

Findings

Asymmetric Kondo side peaks due to photon-assisted tunneling

Prediction of a zero-bias electron-photon pump based on the Kondo effect

Resonant side peaks with narrower widths in differential conductance

Abstract

The influence of high-frequency fields on quantum transport through a quantum dot is studied in the low-temperature regime. We generalize the non crossing approximation for the infinite-U Anderson model to the time-dependent case. The dc spectral density shows asymmetric Kondo side peaks due to photon-assisted resonant tunneling. As a consequence we predict an electron-photon pump at zero bias which is purely based on the Kondo effect. In contrast to the resonant level model and the time-independent case we observe asymmetric peak amplitudes in the Coulomb oscillations and the differential conductance versus bias voltage shows resonant side peaks with a width much smaller than the tunneling rate. All the effects might be used to clarify the question whether quantum dots indeed show the Kondo effect.