Non-equilibrium spin-current detection with a single Kondo impurity

Abstract

We present a theoretical study based on the Anderson model of the transport properties of a Kondo impurity (atom or quantum dot) connected to ferromagnetic leads, which can sustain a non-equilibrium spin current. We analyze the case where the spin current is injected by an external source and when it is generated by the voltage bias. Due to the presence of ferromagnetic contacts, a static exchange field is produced that eventually destroys the Kondo correlations. We find that such a field can be compensated by an appropriated combination of the spin-dependent chemical potentials leading to the restoration of the Kondo resonance. In this respect, a Kondo impurity may be regarded as a very sensitive sensor for non-equilibrium spin phenomena.

10 pages, 5 figures, final version

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Cited by in corpus (7)

• Kondo resonance of a Co atom exchange coupled to a ferromagnetic tip
• Kondo screening of Andreev bound states in an N-QD-S system
• Nonequilibrium Kondo effect by equilibrium numerical renormalization group method: The hybrid Anderson model subject to a finite spin bias
• Nonequilibrium Kondo effect in a graphene-coupled quantum dot in the presence of a magnetic field
• Inelastic Kondo-Andreev tunnelings in a vibrating quantum dot
• Transverse anisotropy effects on spin-resolved transport through large-spin molecules
• Out-of-equilibrium Kondo Effect in a Quantum Dot: Interplay of Magnetic Field and Spin Accumulation