Abstract
Dynamic polarization of nuclear spins has been studied in the breakdown regime of fractional quantum Hall effect using a Corbino-disk device. We find that nuclear spins are polarized in the Corbino disk in the breakdown regime of fractional quantum Hall effect. Since edge channel is completely absent in the Corbino disk, the demonstration of dynamic nuclear polarization in the Corbino disk shows that nuclear spins are polarized and detected in the bulk channel of the quantum Hall conductor.
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