Transport through a double quantum dot system with non-collinearly polarized leads

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dc.creatorHornberger, Ralph Peter
dc.creatorKoller, Sonja
dc.creatorBegemann, Georg
dc.creatorDonarini, Andrea
dc.creatorGrifoni, Milena
dc.date2007-12-05
dc.date2008-07-01
dc.date.accessioned2026-07-07T09:47:16Z
dc.date.available2026-07-07T09:47:16Z
dc.descriptionWe investigate linear and non-linear transport in a double quantum dot system weakly coupled to spin-polarized leads. In the linear regime, the conductance as well as the non-equilibrium spin accumulation are evaluated in analytic form. The conductance as a function of the gate voltage exhibits four peaks of different height, with mirror symmetry with respect to the charge neutrality point. As the polarization angle is varied, the position and shape of the peaks changes in a characteristic way which preserves the electron-hole symmetry of the problem. In the nonlinear regime negative differential conductance features occur for non collinear magnetisations of the leads. In the considered sequential tunneling limit, the tunneling magneto resistance (TMR) is always positive with a characteristic gate voltage dependence for non-collinear magnetization. If a magnetic field is added to the system, the TMR can become negative.
dc.description18 pages, 13 figures, 5 tables; revised published version
dc.identifierhttps://arxiv.org/abs/0712.0757
dc.identifierhttp://arxiv.org/abs/0712.0757
dc.identifierPhys. Rev. B 77, 245313 (2008)
dc.identifierdoi:10.1103/PhysRevB.77.245313
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/163815
dc.subjectMesoscale and Nanoscale Physics
dc.titleTransport through a double quantum dot system with non-collinearly polarized leads
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