Publication: Spin Polarized Current Generation from Quantum Dots without Magnetic Fields
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Date
2008
Published Version
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Publisher
American Physical Society
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Citation
Krich, Jacob J. and Bertrand I. Halperin. 2008. Spin polarized current generation from quantum dots without magnetic fields. Physical Review B 78, no. 3: 035338.
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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 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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Keywords
spin-orbit interactions, spin polarised transport, quantum dots
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