Spin-polarized tunneling microscopy and the Kondo effect
Kelly R. Patton, Stefan Kettemann, Andrey Zhuravlev, and Alexander, Lichtenstein
TL;DR
This paper develops a theoretical model for spin-polarized STM measurements of a Kondo impurity, revealing how spin polarization influences the Kondo resonance and its splitting.
Contribution
It introduces a theory describing how spin-polarized STM affects the Kondo effect, specifically the splitting of the resonance due to spin polarization.
Findings
Spin polarization causes splitting of the Kondo resonance.
Splitting depends on coupling strength and spin polarization.
The theory parallels effects of an applied magnetic field.
Abstract
We present a theory for spin-polarized scanning tunneling microscopy (SP-STM) of a Kondo impurity on an unpolarized metallic substrate. The spin polarization of the SP-STM breaks the spin symmetry of the Kondo system, similar to an applied magnetic field, leading to a splitting of the Abrikosov-Suhl-Kondo resonance. The amount of splitting is controlled by the strength of the coupling between the impurity and the SP-STM tip and also the overall spin polarization of the SP-STM.
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