Spin polarized photocurrent from quantum dots

Details Spin polarized photocurrent from quantum dots Spin polarized photocurrent from quantum dots

2005-09-28

arxiv.org/abs/cond-mat/0509731v1

Phys. Rev. B 75, 155334 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Submitted to PRL

Scientific paper

10.1063/1.1994290

In this paper we show that it is possible to switch the spin polarization of the photocurrent signal obtained from a single self-assembled quantum dot photodiode under the effect of elliptically polarized light by just increasing the light intensity. In the nonlinear mechanism treated here, intense elliptically polarized light creates an effective exchange interaction between the exciton spin states through the biexciton state. This effect can be used as a dynamical switch to invert the spin-polarization of the extracted photocurrent. We further show that the effect persists in realistic ensembles of dots, making this a powerful technique to dynamically generate spin-polarized electrons.

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