Fano-Kondo Spin Filter
A.C. Seridonio, F.M. Souza, J. Del Nero, I.A. Shelykh
TL;DR
This paper investigates how a ferromagnetic STM tip interacting with a metallic surface with an adatom can produce highly spin-polarized currents due to the interplay of Kondo resonance, quantum interference, and ferromagnetism.
Contribution
It introduces a detailed analysis of spin-dependent conductance in a Fano-Kondo system, revealing conditions for 100% spin polarization in current generation.
Findings
Spin-splitting of Fano-Kondo line shape due to tip-adatom interaction.
Strong enhancement of Fano-Kondo profile for majority spin.
Achieving 100% spin polarization in conductance.
Abstract
We study spin-dependent conductance in a system composed of a ferromagnetic (FM) Scanning Tunneling Microscope (STM) tip coupled to a metallic host surface with an adatom. The Kondo resonance is taken into account via the Doniach-Sunjic spectral function. For short lateral tip-adatom distances and due to the interplay between Kondo physics, quantum interfering effects and the ferromagnetism of the tip, a spin-splitting of the Fano-Kondo line shape arises in the conductance. A strong enhancement of the Fano-Kondo profile for the majority spin component of the FM tip is observed. When the tip is placed on the adatom, this gives a conductance 100 % polarized for a particular range of bias voltage. The system thus can be used as a powerful generator of spin polarized currents.
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