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Power dependence of pure spin current injection by quantum interference
Ruzicka, Brian Andrew Zhao, Hui
Ruzicka, Brian Andrew
Zhao, Hui
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Abstract
We investigate the power dependence of pure spin current injection in GaAs bulk and quantumwell
samples by a quantum interference and control technique. Spin separation is measured as a function of the relative strength of the two transition pathways driven by two laser pulses. By keeping the relaxation time of the current unchanged, we are able to relate the spin separation to the injected average velocity. We find that the average velocity is determined by the relative strength of the two transitions in the same way as in classical interference. Based on this, we conclude that the density of injected pure spin current increases monotonically with the excitation laser intensities. The experimental results are consistent with theoretical calculations based on Fermi’s golden rule.
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Date
2009-04
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American Physical Society
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Materials Science, Optics, Mesoscale and Nanoscale Physics
Citation
B.A. Ruzicka and Hui Zhao, Power dependence of pure spin current injection by quantum interference. Physical Review B 79, 155204 (2009) http://link.aps.org/doi/10.1103/PhysRevB.79.155204