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We propose a spin Hall device to induce a large spin Hall effect in asuperconductor/normal metal (SN) junction. The side jump and skew scatteringmechanisms are both taken into account to calculate the extrinsic spin Hallconductivity in the normal metal. We find that both contributions areanomalously enhanced when the voltage between the superconductor and the normalmetal approaches to the superconducting gap. This enhancement is attributed tothe resonant increase of the density of states in the normal metal at the Fermilevel. Our results demonstrate a novel way to control and amplify the spin Hallconductivity by applying an external dc electric field, suggesting that a SNjunction has a potential application for a spintronic device with a large spinHall effect.

Anomalous enhancement of spin Hall conductivity in superconductor/normal metal junction