In 2D spin-orbit coupled systems, circularly polarized light can drive pure spin photocurrents, which vanish in all k-linear models unless a Zeeman field splits the bands.
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Shift spin photocurrents in two-dimensional systems
In 2D spin-orbit coupled systems, circularly polarized light can drive pure spin photocurrents, which vanish in all k-linear models unless a Zeeman field splits the bands.