Spin Polarized Current Generation from Quantum Dots without Magnetic Fields

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Spin Polarized Current Generation from Quantum Dots without Magnetic Fields

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Title: Spin Polarized Current Generation from Quantum Dots without Magnetic Fields
Author: Halperin, Bertrand; Krich, Jacob

Note: Order does not necessarily reflect citation order of authors.

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.
Published Version: http://dx.doi.org/10.1103/PhysRevB.78.035338
Other Sources: http://arxiv.org/abs/0801.2592v2
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3110943

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  • FAS Scholarly Articles [6898]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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