Phys. Rev. Lett. 94, 047402 (2005) [4 pages]Optical Pumping of the Electronic and Nuclear Spin of Single Charge-Tunable Quantum DotsReceived 18 June 2004; published 2 February 2005 We present a comprehensive examination of optical pumping of spins in individual GaAs quantum dots as we change the net charge from positive to neutral to negative with a charge-tunable heterostructure. Negative photoluminescence polarization memory is enhanced by optical pumping of ground state electron spins, which we prove with the first measurements of the Hanle effect on an individual quantum dot. We use the Overhauser effect in a high longitudinal magnetic field to demonstrate efficient optical pumping of nuclear spins for all three charge states of the quantum dot. URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.047402
DOI:
10.1103/PhysRevLett.94.047402
PACS:
78.67.Hc, 71.35.Pq, 71.70.Jp, 72.25.Fe
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