Inversion of the spin polarization of localized electrons driven by dark excitons

Details Inversion of the spin polarization of localized electrons driven by dark excitons Inversion of the spin polarization of localized electrons driven by dark excitons

2008-01-09

arxiv.org/abs/0801.1457v1

Physics

Condensed Matter

Other Condensed Matter

3 figures

Scientific paper

The creation of free excitons by absorption of circularly polarized photons, and their subsequent fast capture by donors, is at the origin of the spin polarization of donor-bound electrons. The sign of the electronic spin polarization at low density of excitation is, as expected, fixed by the helicity of the exciting light; but at high density of excitation we show that the spin polarization is of the opposite sign. This striking inversion is explained, here, by the contribution of dark excitons to mechanisms of spin polarization of localized electrons.

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