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(a) The total spin current response versus photon energy (subtracted by the bandgap energy Eg), along with the separate electron and hole contributions (b) the total spin current response for electron velocity in the x-direction, and light polarized in the x-direction. (c) the same as (b), but with light polarized in the y-direction. (d) the total spin current response for electron velocity in the y-direction, and light polarized in the y-direction.
