Spin effects in electron tunnelling through a quantum dot coupled to non-collinearly polarized ferromagnetic leads

Abstract

Spin-dependent transport through an interacting single-level quantum dot coupled to ferromagnetic leads with non-collinear magnetizations is analyzed theoretically. The transport properties and average spin of the dot are investigated within the nonequilibrium Green function technique based on the equation of motion in the Hartree-Fock approximation. Numerical results show that Coulomb correlations on the dot and strong spin polarization of the leads significantly enhance precession of the average dot spin around the effective molecular field created by the external electrodes. Moreover, they also show that spin precession may lead to negative differential conductance in the voltage range between the two relevant threshold voltages. Nonmonotonous angular variation of electric current and change in sign of the tunnel magnetoresistance are also found. It is also shown that the diode-like behavior in asymmetrical junctions with one electrode being half-metallic is significantly reduced in noncollinear configurations.

arXiv comment10 pages, 10 figures, changed content, updated references

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Cited by in corpus (25)

• Spin effects in single electron tunneling
• Kondo effect in quantum dots coupled to ferromagnetic leads with noncollinear magnetizations
• Spin Current and Current-Induced Spin Transfer Torque in Ferromagnet-Quantum Dot-Ferromagnet Coupled Systems
• Transport through a double quantum dot system with non-collinearly polarized leads
• The formation of nonequilibrium steady states in interacting double quantum dots: When coherences dominate the charge distribution
• Cotunneling through quantum dots coupled to magnetic leads: zero-bias anomaly for non-collinear magnetic configurations
• Spin-induced charge correlations in transport through interacting quantum dots with ferromagnetic leads
• Non-equilibrium theory for strongly coupled quantum dot with arbitrary on-site correlation strength
• Non-collinear single-electron spin-valve transistors
• Non-collinear magnetoconductance of a quantum dot
• Spin resonance without spin splitting
• Generation of pure spin currents by superconducting proximity effect in quantum dots
• Exchange effects on electron transport through single-electron spin-valve transistors
• Influence of spin waves on transport through a quantum-dot spin valve
• Spin-dependent transport through quantum-dot Aharonov-Bohm interferometers
• Interplay between interference and Coulomb interaction in the ferromagnetic Anderson model with applied magnetic field
• Role of coherence in transport through engineered atomic spin devices
• Two-electron bound states in continuum in quantum dots
• Pseudospin resonances reveal synthetic spin-orbit interaction
• Theory of transport through noncollinear single-electron spin-valve transistors
• Single-spin polaron memory effect
• Spin transport properties of a quantum dot coupled to ferromagnetic leads with noncollinear magnetizations
• Multilevel coherences in quantum dots
• Interaction-induced current asymmetries in resonant transport through interacting quantum-dot spin valves revealed by iterative summation of path integrals
• Influence of spin-flip on the performance of the spin-diode