Quantum Dot as a Spin--Current Diode

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dc.creatorSouza, F. M.
dc.creatorEgues, J. C.
dc.creatorJauho, A. P.
dc.date2006-11-13
dc.date2007-04-09
dc.date.accessioned2026-07-07T07:55:36Z
dc.date.available2026-07-07T07:55:36Z
dc.descriptionWe report a study of spin dependent transport in a system composed of a quantum dot coupled to a normal metal lead and a ferromagnetic lead (NM-QD-FM). We use the master equation approach to calculate the spin-resolved currents in the presence of an external bias and an intra-dot Coulomb interaction. We find that for a range of positive external biases (current flow from the normal metal to the ferromagnet) the current polarization $\wp=(I_\uparrow-I_\downarrow)/(I_\uparrow+I_\downarrow)$ is suppressed to zero, while for the corresponding negative biases (current flow from the ferromagnet to the normal metal) $\wp$ attains a relative maximum value. The system thus operates as a rectifier for spin--current polarization. This effect follows from an interplay between Coulomb interaction and nonequilibrium spin accumulation in the dot. In the parameter range considered, we also show that the above results can be obtained via nonequilibrium Green functions within a Hartree-Fock type approximation.
dc.description7 two-column pages, 5 figures. v2 (published): title changed, some added text to Sec. II and Appendix and some minor changes to the figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0611336
dc.identifierhttp://arxiv.org/abs/cond-mat/0611336
dc.identifierPhys. Rev. B 75, 165303 (2007)
dc.identifierdoi:10.1103/PhysRevB.75.165303
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/127025
dc.subjectMesoscale and Nanoscale Physics
dc.titleQuantum Dot as a Spin--Current Diode
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