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Paper detail

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

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

preprint2012arXivOpen access
Kensaku ChidaMasayuki HashisakaYoshiaki YamauchiShuji NakamuraTomonori ArakawaTomoki MachidaKensuke KobayashiTeruo Ono
cond-mat.mes-hall
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Kensaku ChidaMasayuki HashisakaYoshiaki YamauchiShuji NakamuraTomonori ArakawaTomoki MachidaKensuke KobayashiTeruo Ono

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