Gate-controlled spin-splitting in quantum dots with ferromagnetic leads in the Kondo regime

Abstract

The effect of a gate voltage ($V_g$) on the spin-splitting of an electronic level in a quantum dot (QD) attached to ferromagnetic leads is studied in the Kondo regime using a generalized numerical renormalization group technique. We find that the $V_g$-dependence of the QD level spin-splitting strongly depends on the shape of the density of states (DOS). For one class of DOS shapes there is nearly no $V_g$-dependence, for another, $V_g$ can be used to control the magnitude and sign of the spin-splitting, which can be interpreted as a local exchange magnetic field. We find that the spin-splitting acquires a new type of logarithmic divergence. We give an analytical explanation for our numerical results and explain how they arise due to spin-dependent charge fluctuations.

4 pages, 2 figures

References in corpus (12)

• Kondo effect in an integer-spin quantum dot
• Transport Coefficients of the Anderson Model via the Numerical Renormalization Group
• Kondo effect in quantum dots coupled to ferromagnetic leads
• NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
• Interaction-driven spin precession in quantum-dot spin valves
• Kondo effect in a quantum dot coupled to ferromagnetic leads: A numerical renormalization group analysis
• Numerical Renormalization Group for Quantum Impurities in a Bosonic Bath
• Nonequilibrium spintronic transport through an artificial Kondo impurity: Conductance, magnetoresistance and shot noise
• Anderson impurity in pseudo-gap Fermi systems
• Spin-Dependent Transport Through An Interacting Quantum Dot
• Interference and interaction effects in multi-level quantum dots
• Spin Dependent Transport in Magnetic Nanostructures

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