Pumping of nuclear spins by the optical solid effect in a quantum dot

Details Pumping of nuclear spins by the optical solid effect in a quantum dot Pumping of nuclear spins by the optical solid effect in a quantum dot

2009-06-29

arxiv.org/abs/0906.5260v2

Phys. Rev. Lett. 104, 066804 (2010) - Published February 12, 2010

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

We demonstrate that efficient optical pumping of nuclear spins in semiconductor quantum dots (QDs) can be achieved by resonant pumping of optically "forbidden" transitions. This process corresponds to one-to-one conversion of a photon absorbed by the dot into a polarized nuclear spin, which also has potential for initialization of hole spin in QDs. Pumping via the "forbidden" transition is a manifestation of the "optical solid effect", an optical analogue of the effect previously observed in electron spin resonance experiments in the solid state. We find that by employing this effect, nuclear polarization of 65% can be achieved, the highest reported so far in optical orientation studies in QDs. The efficiency of the spin pumping exceeds that employing the allowed transition, which saturates due to the low probability of electron-nuclear spin flip-flop.

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