Complete spin polarization of electrons in semiconductor layers and quantum dots

Details Complete spin polarization of electrons in semiconductor layers and quantum dots Complete spin polarization of electrons in semiconductor layers and quantum dots

2005-06-24

arxiv.org/abs/cond-mat/0506670v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1063/1.2128060

We demonstrate that non-equilibrium electrons in thin nonmagnetic semiconductor layers or quantum dots can be fully spin polarized by means of simultaneous electrical spin injection and extraction. The complete spin polarization is achieved if the thin layers or quantum dots are placed between two ferromagnetic metal contacts with moderate spin injection coefficients and antiparallel magnetizations. The sign of the spin polarization is determined by the direction of the current. Aplications of this effect in spintronics and quantum information processing are discussed.

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