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We use time-resolved Faraday rotation to measure coherent spin dynamics incolloidal CdSe quantum dots charged in an electrochemical cell at roomtemperature. Filling of the 1Se electron level is demonstrated by the bleachingof the 1Se-1S3/2 absorption peak. One of the two Lande g-factors observed inuncharged quantum dots disappears upon filling of the 1Se electron state. Thetransverse spin coherence time, which is over 1 ns and is limited byinhomogeneous dephasing, also appears to increase with charging voltage. Theamplitude of the spin precession signal peaks near the half-filling potential.Its evolution at charging potentials without any observable bleaching of the1Se-1S3/2 transition suggests that the spin dynamics are influenced bylow-energy surface states.Comment: 4 pages, 4 figure

Spin dynamics in electrochemically charged CdSe quantum dots