Asymmetric optical nuclear spin pumping in a single uncharged quantum dot

Details Asymmetric optical nuclear spin pumping in a single uncharged quantum dot Asymmetric optical nuclear spin pumping in a single uncharged quantum dot

2010-07-13

arxiv.org/abs/1007.2145v2

Phys. Rev. B 82, 121307(R) (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

published version; 4+ pages, 3 figures (eps)

Scientific paper

10.1103/PhysRevB.82.121307

A highly asymmetric dynamic nuclear spin pumping is observed in a single self assembled InGaAs quantum dot subject to resonant optical pumping of the neutral exciton transition leading to a large maximum polarization of 54%. This dynamic nuclear polarization is found to be much stronger following pumping of the higher energy Zeeman state. Time-resolved measurements allow us to directly monitor the buildup of the nuclear spin polarization in real time and to quantitatively study the dynamics of the process. A strong dependence of the observed dynamic nuclear polarization on the applied magnetic field is found, with resonances in the pumping efficiency being observed for particular magnetic fields. We develop a model that fully accounts for the observed behaviour, where the pumping of the nuclear spin system is due to hyperfine-mediated spin flip transitions between the states of the neutral exciton manifold.

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