Nonadiabatic features of electron pumping through a quantum dot 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 Ω0 and a phase lag φ. We provide analytical functions to describe the fingerprints of the Coulomb interaction in an experimental Jdc vs φ characteristic curve. We show that the Kondo resonance, at low temperatures, reduces the frequency range for the linear behavior of Jdc in Ω0 to take place and determines the evolution of the dc current as the temperature increases. © 2008 The American Physical Society.