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The ratio as a function of the electron concentration . Dashed curve: , solid curve , the QW width . The parameters are: , , , , where is a free electron mass.
(a) The intersubband transitions leading to the injection of pure spin current. Thick arrow line corresponds to . Thin arrow lines correspond to transitions at . (b) Resonance curves . Solid (dash) lines describe the spin-conserving (spin–flip) transitions. In each case the outer curve is for and the inner curve for . The circle marked as is the Fermi line at . The parameters are: , , , , and .
(a) The speed for different constants (values in units are presented near the curves). Other parameters are the same as in Fig. 2, , and . (b) Components of the induced spin current for .
-dependence of for different parameters . The units of incident light power density are . We take an incidence angle , , and . The rigid QW walls model is used for the calculation.
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