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When an electric current passes across a potential barrier, the partitionprocess of electrons at the barrier gives rise to the shot noise, reflectingthe discrete nature of the electric charge. Here we report the observation ofexcess shot noise connected with a spin current which is induced by anonequilibrium spin accumulation in an all-semiconductor lateral spin-valvedevice. We find that this excess shot noise is proportional to the spincurrent. Additionally, we determine quantitatively the spin-injection-inducedelectron temperature by measuring the current noise. Our experiments show thatspin accumulation driven shot noise provides a novel means of investigatingnonequilibrium spin transport.

Shot Noise Induced by Nonequilibrium Spin Accumulation