Local control of spin flow in weak magnetic fields

Details Local control of spin flow in weak magnetic fields Local control of spin flow in weak magnetic fields

2008-10-24

arxiv.org/abs/0810.4390v1

Physics

Condensed Matter

Materials Science

Scientific paper

We demonstrate that optical illumination strongly influences spin transport in n-type GaAs. Specifically, increasing the power density of optical spin pumping results in a significant expansion of the spin diffusion profile. A further means of manipulation is the application of a weak transverse magnetic field, which strongly increases spin flow out of the excitation spot. These effects are directly monitored in spin imaging experiments and spatially resolved Hanle measurements.

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