Optically-patterned nuclear doughnuts in GaAs/MnAs heterostructures

Details Optically-patterned nuclear doughnuts in GaAs/MnAs heterostructures Optically-patterned nuclear doughnuts in GaAs/MnAs heterostructures

2004-04-10

arxiv.org/abs/cond-mat/0404244v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 3 figures

Scientific paper

10.1063/1.1781743

We demonstrate a scheme for optically patterning nuclear spin polarization in semiconductor/ferromagnet heterostructures. A scanning time-resolved Kerr rotation microscope is used to image the nuclear spin polarization that results when GaAs/MnAs epilayers are illuminated with a focused laser having a Gaussian profile. Rather than tracking the intensity profile of the laser spot, these images reveal that the nuclear polarization forms an annular lateral structure having circular symmetry with a dip rather than a peak at its center.

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