We report on measurements of the spin relaxation time T1 of individualelectron spins in the few electron regime of a Si/SiO2-based quantum dot (QD).Energy-spectroscopy of the QD has been performed using a charge sensingtechnique. The spin relaxation times are subsequently measured in thetime-domain by a pump-and-probe method. For the QD that contains an unpairedspin, likely only a single electron, we find that T1 depends strongly on theapplied magnetic field. Possible mechanisms leading to the observed spinrelaxation are discussed.
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