Kondo effect in a one-electron double quantum dot : Oscillations of the Kondo current in a weak magnetic field

We present transport measurements of the Kondo effect in a double quantum dot charged with only one or two electrons, respectively. For the one-electron case, we observe a surprising quasiperiodic oscillation of the Kondo conductance as a function of a small perpendicular magnetic field $\ensuremath{\mid}{B}_{\ensuremath{\perp}}\ensuremath{\mid}\ensuremath{\lesssim}50\phantom{\rule{0.3em}{0ex}}\mathrm{mT}$. We discuss possible explanations of this effect and interpret it by means of a fine tuning of the energy mismatch of the single dot levels of the two quantum dots. The observed degree of control implies important consequences for applications in quantum information processing.