Spin filter using a semiconductor quantum ring side coupled to a quantum wire

Lee, M. and Bruder, C.. (2006) Spin filter using a semiconductor quantum ring side coupled to a quantum wire. Physical Review B, Vol. 73, H. 8 , 085315, 5 S..

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Official URL: http://edoc.unibas.ch/dok/A5252831

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We introduce a spin filter based on spin-resolved Fano resonances due to spin-split levels in a quantum ring (QR) side coupled to a quantum wire (QW). Spin-orbit coupling inside the QR, together with external magnetic fields, induces spin splitting, and the Fano resonances due to the spin-split levels result in perfect or considerable suppression of the transport of either spin direction. Using the numerical renormalization group method, we find that the Coulomb interaction in the QR enhances the spin-filter operation by widening the separation between dips in conductances for different spins and by allowing perfect blocking for one spin direction and perfect transmission for the other. The spin-filter effect persists as long as the temperature is less than the broadening of QR levels due to the QW-QR coupling. We discuss realistic conditions for the QR-based spin filter and its advantages to other similar devices.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Bruder)
UniBasel Contributors:Bruder, Christoph
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Institute of Physics
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:25
Deposited On:22 Mar 2012 13:48

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