Spin polarized current generation from quantum dots without magnetic fields

Details Spin polarized current generation from quantum dots without magnetic fields Spin polarized current generation from quantum dots without magnetic fields

2008-01-17

arxiv.org/abs/0801.2592v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 3 figures. Revised version with reference to Bardarson, Adagideli, and Jacquod, Phys Rev Lett 98, 196601 (2007), who

Scientific paper

10.1103/PhysRevB.78.035338

An unpolarized charge current passing through a chaotic quantum dot with spin-orbit coupling can produce a spin polarized exit current without magnetic fields or ferromagnets. We use random matrix theory to estimate the typical spin polarization as a function of the number of channels in each lead in the limit of large spin-orbit coupling. We find rms spin polarizations up to 45% with one input channel and two output channels. Finite temperature and dephasing both suppress the effect, and we include dephasing effects using a new variation of the third lead model. If there is only one channel in the output lead, no spin polarization can be produced, but we show that dephasing lifts this restriction.

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