Estimation of electronic confinement in a quantum dot from envelope modulation of Coulomb blockade oscillations

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Abstract
Envelope modulation of Coulomb blockade oscillations has been observed in the conductance of a semiconductor quantum dot weakly connected to two reservoirs through tunneling barriers and subjected to magnetic fields. Although the number of conductance peaks per modulation period has been reported to be constant, we find that in moderate magnetic fields the number of peaks per period decreases one by one as gate voltage is changed. This results from the electronic depopulation of a single Landau level per modulation period. Comparing this result with calculated energy levels, the strength of electronic confinement is estimated to be 2.2 meV.