Density profiles (upper panel) and energy-band profiles (lower panel).
Electron mobilities (solid lines) including the effect of scattering and (dashed lines) without scattering at a density of and . , for spin-up electrons (majority spin) and , for spin-down electrons (minority spin).
Upper panel: Diffusion coefficients (solid lines) with interaction and (dashed lines) without interaction at a density of and . Lower panel: Diffusion coefficients with interaction under the same conditions. Notice the different vertical scales in the two panels.
Upper panel: Diffusion current densities when only the spin-drag effect is included (solid lines). A dashed line shows a current density when interaction is ignored. Lower panel: Diffusion current densities when both of spin-drag and bandgap narrowing effects are included. , (,) for spin-up electrons (spin-down electrons) and , for the total current. A density gradient of , , is assumed. Positive values mean that electrons flow from high density to low density.
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