Spin-polarized current and shot noise in the presence of spin flip in a quantum dot via nonequilibrium Green's functions

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dc.creatorSouza, F. M.
dc.creatorJauho, A. P.
dc.creatorEgues, J. C.
dc.date2008-02-07
dc.date2008-10-31
dc.date.accessioned2026-07-07T10:13:59Z
dc.date.available2026-07-07T10:13:59Z
dc.descriptionUsing non-equilibrium Green functions we calculate the spin-polarized current and shot noise in a ferromagnet--quantum-dot--ferromagnet (FM-QD-FM) system. Both parallel (P) and antiparallel (AP) magnetic configurations are considered. Coulomb interaction and coherent spin-flip (similar to a transverse magnetic field) are taken into account within the dot. We find that the interplay between Coulomb interaction and spin accumulation in the dot can result in a bias-dependent current polarization $\wp$. In particular, $\wp$ can be suppressed in the P alignment and enhanced in the AP case depending on the bias voltage. The coherent spin-flip can also result in a switch of the current polarization from the emitter to the collector lead. Interestingly, for a particular set of parameters it is possible to have a polarized current in the collector and an unpolarized current in the emitter lead. We also found a suppression of the Fano factor to values well below 0.5.
dc.descriptionPublished version. 13 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/0802.0982
dc.identifierhttp://arxiv.org/abs/0802.0982
dc.identifierPhys. Rev. B 78, 155303 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.155303
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/172725
dc.subjectMesoscale and Nanoscale Physics
dc.titleSpin-polarized current and shot noise in the presence of spin flip in a quantum dot via nonequilibrium Green's functions
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