Spin polarized current generation from quantum dots without magnetic fields
arXiv:0801.2592 · doi:10.1103/PhysRevB.78.035338
Abstract
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.
7 pages, 3 figures. Revised version with reference to Bardarson, Adagideli, and Jacquod, Phys Rev Lett 98, 196601 (2007), who performed an analogous calculation in a different geometry
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- Spin Accumulation in Diffusive Conductors with Rashba and Dresselhaus Spin-Orbit Interaction
- Generation and Detection of Spin Currents in Semiconductor Nanostructures with Strong Spin-Orbit Interaction
- Enhanced spin Hall effect by tuning antidot potential: Proposal for a spin filter
- Facile fabrication of lateral nanowire wrap-gate devices with improved performance
- Electrical probing of the spin conductance of mesoscopic cavities
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