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

Abstract

We 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.

18 pages, 13 figures, 5 tables; revised published version

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Cited by in corpus (28)

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• Effects of different geometries on the conductance, shot noise and tunnel magnetoresistance of double quantum dots
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• Interference effects in the Coulomb blockade regime: current blocking and spin preparation in symmetric nanojunctions
• Probing the exchange field of a quantum-dot spin valve by a superconducting lead
• Negative tunnel magnetoresistance and differential conductance in transport through double quantum dots
• Theory of spin blockade, charge ratchet effect, and thermoelectrical behavior in serially coupled quantum-dot system
• Thermoelectric study of dissipative quantum dot heat engines
• Subgap features due to quasiparticle tunneling in quantum dots coupled to superconducting leads
• Waiting time distribution revealing the internal spin dynamics in a double quantum dot
• Tunneling transport through multi-electrons states in coupled quantum dots with Coulomb correlations
• Charge and spin configurations in the coupled quantum dots with Coulomb correlations induced by tunneling current
• Andreev tunneling through a double quantum-dot system coupled to a ferromagnet and a superconductor: effects of mean field electronic correlations
• Thermoelectric spin accumulation and long-time spin precession in a non-collinear quantum dot spin valve
• Influence of spin waves on transport through a quantum-dot spin valve
• Feynman-Vernon influence functional approach to quantum transport in interacting nanojunctions: An analytical hierarchical study
• Sources of negative tunneling magneto-resistance in multilevel quantum dots with ferromagnetic contacts
• Dynamical symmetry breaking in vibration-assisted transport through nanostructures
• Pseudospin resonances reveal synthetic spin-orbit interaction
• Spectrum and Franck-Condon factors of interacting suspended single-wall carbon nanotubes
• Vibration induced memory effects and switching in ac-driven molecular nanojunctions
• Pauli spin blockade with site-dependent g-tensors and spin-polarized leads
• Spin-dependent transport through interacting graphene armchair nanoribbons
• Multilevel coherences in quantum dots
• Classical information driven quantum dot thermal machines
• Optimal Single Quantum Dot Heat-to-pure-spin-current Converters
• Diagnostics of many-particle electronic states from non-stationary currents and residual charge
• Revealing the internal spin dynamics in a double quantum dot by periodic voltage modulation