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Efficient dynamic nuclear polarization of phosphorus in silicon in strong magnetic fields and at low temperatures

Efficient dynamic nuclear polarization of phosphorus in silicon in strong magnetic fields and at low temperatures

We demonstrate that the dynamic nuclear polarization (DNP) of phosphorus donors in silicon can be very effective in a magnetic field of 4.6 T and at temperatures below 1 K. The DNP occurs due to the Overhauser effect following a cross relaxation via the forbidden flip-flop or flip-flip transitions. Nuclear …