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Cotunneling spectroscopy in few-electron quantum dots
Authors:Zumbühl D M  Marcus C M  Hanson M P  Gossard A C
Institution:Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Abstract:Few-electron quantum dots are investigated in the regime of strong tunneling to the leads. Inelastic cotunneling is used to measure the two-electron singlet-triplet splitting above and below a magnetic field driven singlet-triplet transition. Evidence for a nonequilibrium two-electron singlet-triplet Kondo effect is presented. Cotunneling allows orbital correlations and parameters characterizing entanglement of the two-electron singlet ground state to be extracted from dc transport.
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