Mesoscopic Fano effect in a spin splitter with a side-coupled quantum dot

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buir.contributor.authorTanatar, Bilal
buir.contributor.orcidTanatar, Bilal|0000-0002-5246-0119
dc.citation.epage1083en_US
dc.citation.issueNumber10-11en_US
dc.citation.spage1078en_US
dc.citation.volumeNumber376en_US
dc.contributor.authorMoldoveanu, V.en_US
dc.contributor.authorTolea, M.en_US
dc.contributor.authorTanatar, Bilalen_US
dc.date.accessioned2016-02-08T09:48:23Z
dc.date.available2016-02-08T09:48:23Z
dc.date.issued2012en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractWe investigate the interplay between the spin interference and the Fano effect in a three-lead mesoscopic ring with a side-coupled quantum dot (QD). A uniform Rashba spin-orbit coupling and a perpendicular magnetic field are tuned such that the ring operates as a spin splitter in the absence of the QD: one lead is used to inject unpolarized electrons and the remaining (output) leads collect almost polarized spin currents. By applying a gate potential to the quantum dot a pair of spin-split levels sweeps the bias window and leads to Fano interference. The steady-state spin and charge currents in the leads are calculated for a finite bias applied across the ring via the non-equilibrium Green's function formalism. When the QD levels participate to transport we find that the spin currents exhibit peaks and dips whereas the charge currents present Fano lineshapes. The location of the side-coupled quantum dot and the spin splitting of its levels also affect the interference and the output currents. The opposite response of output currents to the variation of the gate potential allows one to use this system as a single parameter current switch. We also analyze the dependence of the splitter efficiency on the spin splitting on the QD.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T09:48:23Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2012en
dc.identifier.doi10.1016/j.physleta.2012.02.017en_US
dc.identifier.eissn1873-2429
dc.identifier.issn0375-9601
dc.identifier.urihttp://hdl.handle.net/11693/21585
dc.language.isoEnglishen_US
dc.publisherElsevier B.V.en_US
dc.relation.isversionofhttp://dx.doi.org/10.1016/j.physleta.2012.02.017en_US
dc.source.titlePhysics Letters Aen_US
dc.subjectFano effecten_US
dc.subjectMesoscopic ringsen_US
dc.subjectRashba spin-orbit couplingen_US
dc.titleMesoscopic Fano effect in a spin splitter with a side-coupled quantum doten_US
dc.typeArticleen_US

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