Optical pumping of electronic and nuclear spin in single charge-tunable quantum dots

Details Optical pumping of electronic and nuclear spin in single charge-tunable quantum dots Optical pumping of electronic and nuclear spin in single charge-tunable quantum dots

2004-08-20

arxiv.org/abs/cond-mat/0408466v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.94.047402

We present a comprehensive examination of optical pumping of spins in individual GaAs quantum dots as we change the charge from positive to neutral to negative using a Schottky diode. We observe that photoluminescence polarization memory has the same sign as the net charge of the dot. Optical pumping of ground state electron spins enhances this effect, as demonstrated through the first measurements of the Hanle effect on an individual quantum dot. With the Overhauser effect in a high longitudinal magnetic field, we demonstrate efficient optical pumping of the quantum dot's nuclear spins for all three charge states.

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