Spin Polarized Current Generation from Quantum Dots without Magnetic Fields
MetadataShow full item record
CitationKrich, Jacob J. and Bertrand I. Halperin. 2008. Spin polarized current generation from quantum dots without magnetic fields. Physical Review B 78, no. 3: 035338.
AbstractAn 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.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:3110943
- FAS Scholarly Articles