Large nuclear Overhauser fields detected in vertically-coupled double quantum dots

Abstract

We report the electrical induction and detection of dynamic nuclear polarization in the spin-blockade regime of double GaAs vertical quantum dots. The largest Overhauser field observed was about 4 Tesla, corresponding to a nuclear polarization of about 40% in the present device. A phenomenological model is presented to provide a qualitative understanding of our results.

5 pages, 4 figures, rev-tex. Improved presentation of figures 1-3, also added SEM image to figure 1. Minor changes to discussion section, and added a concluding paragraph

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• Spins in few-electron quantum dots
• Coupled quantum dots as quantum gates
• Electron spin relaxation by nuclei in semiconductor quantum dots
• Electron spin decoherence in quantum dots due to interaction with nuclei
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