Angular Conductance Resonances of Quantum Dots Non-Collinearly Coupled to Ferromagnetic Leads

Abstract

The zero bias conductance of quantum dots coupled to ferromagnetic leads is investigated. In the strong coupling regime, it is found that the conductance is a non-monotonic function of the angle between the magnetisation directions in the two contacts. This behaviour is an effect of the presence of the leads which induces an angle dependent spin split of the quantum dot states, and spin flip transitions between the quantum dot states whenever the magnetisation directions of the leads are non-collinear which enhances the current density at the chemical potential. In the weak coupling regime, the system reverts to normal spin valve character.

arXiv comment4 pages, 4 figures. Europhysics Letters (accepted)

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• Electronic waiting-time distribution of a quantum-dot spin valve
• Transport through a double quantum dot system with non-collinearly polarized leads
• Cotunneling through quantum dots coupled to magnetic leads: zero-bias anomaly for non-collinear magnetic configurations
• Probing the exchange field of a quantum-dot spin valve by a superconducting lead
• Non-equilibrium theory for strongly coupled quantum dot with arbitrary on-site correlation strength
• Non-collinear single-electron spin-valve transistors
• Spin Dynamics in a Tunnel Junction between Ferromagnets
• Spin resonance without spin splitting
• Detection of spin reversal and nutations through current measurements
• Exchange effects on electron transport through single-electron spin-valve transistors
• Subnanosecond switching of local spin-exchange coupled to ferromagnets
• Spin-polarized transport through weakly coupled double quantum dots in the Coulomb-blockade regime
• Theory of spin pumping through an interacting quantum dot tunnel coupled to a ferromagnet with time-dependent magnetization
• Interplay between interference and Coulomb interaction in the ferromagnetic Anderson model with applied magnetic field
• Theory of transport through noncollinear single-electron spin-valve transistors
• The tunnel magnetoresistance in chains of quantum dots weakly coupled to external leads
• Spin transport properties of a quantum dot coupled to ferromagnetic leads with noncollinear magnetizations
• Current fluctuations of noncollinear single-electron spin-valve transistors