Strong electron spin-Hall effect by a coherent optical potential

Details Strong electron spin-Hall effect by a coherent optical potential Strong electron spin-Hall effect by a coherent optical potential

2009-11-18

arxiv.org/abs/0911.3577v2

Semicond. Sci. Technol. 25 095004 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

2 figures

Scientific paper

10.1088/0268-1242/25/9/095004

We demonstrate theoretically that a coherent manipulation of electron spins in low-dimensional semiconductor structures with spin-orbit coupling by infrared radiation is possible. The proposed approach is based on using a dipole force acting on a two-level system in a nonuniform optical field, similar to that employed in the design of the cold atoms diode. For ballistic electrons the spin-dependent force, proportional to the intensity of external radiation, leads to a spin-Hall effect and resulting spin separation even if the spin-orbit coupling itself does not allow for these effects. Achievable spatial separation of electrons with opposite spins can be of the order of several tenth of a micron, an order of magnitude larger than can be produced by the charged impurity scattering in the diffusive regime.

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