Abstract
We study the Kondo effect in a vertical quantum dot holding only one- or two-electrons. We observe clear Kondo features in the temperature and bias voltage dependence of the conductance when there is only one electron in the dot (spin S=1/2). The estimated Kondo temperature is much higher than in previous reports due to large dot-lead tunnel coupling on the order of 800 μeV . We also observe a Kondo enhancement of the conductance when the two-electron ground state makes a transition from a spin singlet ( S=0) to a triplet ( S=1) at a magnetic field of 3.2 T . The bias voltage dependence of the differential conductance at this transition field shows weak features that may be related to the Zeeman splitting of the triplet state.
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