Out-of-equilibrium Kondo Effect in a Quantum Dot: Interplay of Magnetic Field and Spin Accumulation

Abstract

We present a theoretical study of low temperature nonequilibrium transport through an interacting quantum dot in the presence of Zeeman magnetic field and current injection into one of its leads. By using a self-consistent renormalized equation of motion approach, we show that the injection of a spin-polarized current leads to a modulation of the Zeeman splitting of the Kondo peak in the differential conductance. We find that an appropriate amount of spin accumulation in the lead can restore the Kondo peak by compensating the splitting due to magnetic field. By contrast when the injected current is spin-unpolarized, we establish that both Zeeman-split Kondo peaks are equally shifted and the splitting remains unchanged. Our results quantitatively explain the experimental findings reported in KOBAYASHI T. et al., Phys. Rev. Lett. 104, 036804 (2010). These features could be nicely exploited for the control and manipulation of spin in nanoelectronic and spintronic devices.

6+ pages; 3 figures; final version

References in corpus (4)

• Kondo effect in quantum dots coupled to ferromagnetic leads
• Anderson Model out of equilibrium: decoherence effects in transport through a quantum dot
• Kondo Resonance in the Presence of Spin-Polarized Currents
• Compensation of the Kondo effect in quantum dots coupled to ferromagnetic leads within equation of motion approach

Cited by in corpus (3)

• Emission Noise in an Interacting Quantum Dot: Role of Inelastic Scattering and Asymmetric Coupling to the Reservoirs
• 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