Power dependence of pure spin current injection by quantum interference

Details Power dependence of pure spin current injection by quantum interference Power dependence of pure spin current injection by quantum interference

2010-03-09

arxiv.org/abs/1003.1974v1

Phys. Rev. B 79, 155204 (2009)

Physics

Condensed Matter

Materials Science

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.79.155204

We investigate the power dependence of pure spin current injection in GaAs bulk and quantum-well 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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