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Spin-current generation and detection in the presence of an ac gate

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FIG. 1. The dashed curve is the electron energy band without SOI. The SOI splits the energy band into the ↑-spin and the ↓-spin bands, as shown by the solid curves, with corresponding average wave vectors k ↑ and k ↓ .
FIG. 3. Schematic illustration of spin current detection. ac spin current flows from the right to the left under the gate with spin polarized as shown by arrows

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