Non adiabatic features of electron pumping through a quantum dot in the Kondo regime

TL;DR

This paper studies how electron interactions and the Kondo effect influence the dc current in a quantum dot driven by oscillating potentials, revealing how temperature and phase lag affect current behavior.

Contribution

It provides analytical descriptions of Coulomb interaction effects on dc current phase characteristics and explores the impact of the Kondo resonance on current behavior at different temperatures.

Findings

Coulomb interactions shape the phase dependence of dc current.

Kondo resonance suppresses linear current response at low temperatures.

Temperature increases alter the dc-current evolution in the Kondo regime.

Abstract

We investigate the behavior of the dc electronic current, Jdc, in an interacting quantum dot driven by two ac local potentials oscillating with a frequency, Omega0, and a phase-lag, phi. We provide analytical functions to describe the fingerprints of the Coulomb interaction in an experimental Jdc vs phi characteristic curve. We show that the Kondo resonance reduces at low temperatures the frequency range for the linear behavior of Jdc in Omega0 to take place and determines the evolution of the dc-current as the temperature increases.