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Sketch of the proposed spin current source. The material growth direction is along the axis. The left lead electrons are driven by an in-plane ( plane) electric field and the central junction is illuminated by an ac field.
The surface spin current densities as a function of the driven frequency (in units of the hopping matrix term ) for a given external in-plane electric field.
Numerical calculated surface spin current densities versus the polar angle of the in-plane electric field at a fixed frequency .
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