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We study the shot noise (nonequilibrium current fluctuation) associated withdynamic nuclear polarization in a nonequilibrium quantum wire (QW) fabricatedin a two-dimensional electron gas. We observe that the spin-polarizedconductance quantization of the QW in the integer quantum Hall regime collapseswhen the QW is voltage biased to be driven to nonequilibrium. By measuring theshot noise, we prove that the spin polarization of electrons in the QW isreduced to $\sim 0.7$ instead of unity as a result of electron-nuclearspin-flip scattering. The result is supported by Knight shift measurements ofthe QW using resistively detected NMR.

Shot Noise Induced by Electron-nuclear Spin-flip Scattering in a Nonequilibrium Quantum Wire