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We show that a pure spin current can be injected in quantum wells by theabsorption of linearly polarized infrared radiation, leading to transitionsbetween subbands. The magnitude and the direction of the spin current depend onthe Dresselhaus and Rashba spin-orbit coupling constants and light frequencyand, therefore, can be manipulated by changing the light frequency and/orapplying an external bias across the quantum well. The injected spin currentshould be observable either as a voltage generated via the anomalous spin-Halleffect, or by spatially resolved pump-probe optical spectroscopy.Comment: minor changes, short version publishe

Spin current injection by intersubband transitions in quantum wells