Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 25, Pages 5432-5435Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.5432
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We show that quantum interference of one and two photon absorption from a two color field allows one to optically inject ballistic spin currents in unbiased semiconductors. The spin currents can be generated with or without an accompanying electrical current and can be controlled using the relative phase of the two colors. We characterize the injected spin currents using symmetry arguments and an eight-band Kane model.
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