Universality of the Kondo effect in quantum dots with ferromagnetic leads

Abstract

We investigate quantum dots in clean single-wall carbon nanotubes with ferromagnetic PdNi-leads in the Kondo regime. In most odd Coulomb valleys the Kondo resonance exhibits a pronounced splitting, which depends on the tunnel coupling to the leads and an external magnetic field $B$, and only weakly on gate voltage. Using numerical renormalization group calculations, we demonstrate that all salient features of the data can be understood using a simple model for the magnetic properties of the leads. The magnetoconductance at zero bias and low temperature depends in a universal way on $g{\mu }_B(B-B_c)/k_B{T}_K$, where $T_K$ is the Kondo temperature and $B_c$ the external field compensating the splitting.

4 pages, 4 figures

References in corpus (7)

• Sum-rule Conserving Spectral Functions from the Numerical Renormalization Group
• Kondo effect in quantum dots coupled to ferromagnetic leads
• Electric-field controlled spin reversal in a quantum dot with ferromagnetic contacts
• Gate-controlled spin-splitting in quantum dots with ferromagnetic leads in the Kondo regime
• Electronic excitation spectrum of metallic carbon nanotubes
• Magnetoresistance of a quantum dot with spin-active interfaces
• Spin transport across carbon nanotube quantum dots

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