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Local control of spin flow in weak magnetic fields

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arxiv 0810.4390 v1 pith:PBMNRGZ2 submitted 2008-10-24 cond-mat.mtrl-sci

Local control of spin flow in weak magnetic fields

J.-H. Quast , G. V. Astakhov , W. Ossau , L. W. Molenkamp , J. Heinrich , S. Hofling , A. Forchel This is my paper
classification cond-mat.mtrl-sci
keywords spinflowmagneticopticalstronglyweakapplicationcontrol
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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