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Measurements of Kondo and spin splitting in single-electron transistors

A. Kogan·S. Amasha·D. Goldhaber-Gordon·G. Granger·M. A. Kastner·Hadas Shtrikman
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Abstract

We measure the spin splitting in a magnetic field $B$ of localized states in single-electron transistors using a new method, inelastic spin-flip cotunneling. Because it involves only internal excitations, this technique gives the most precise value of the Zeeman energy $Δ= \ZeemanE$. In the same devices we also measure the splitting with $B$ of the Kondo peak in differential conductance. The Kondo splitting appears only above a threshold field as predicted by theory. However, the magnitude of the Kondo splitting at high fields exceeds $2 \ZeemanE$ in disagreement with theory.

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A. Kogan, S. Amasha, D. Goldhaber-Gordon, G. Granger, M. A. Kastner, Hadas Shtrikman. 2004-10-30. Measurements of Kondo and spin splitting in single-electron transistors. https://doi.org/10.1103/physrevlett.93.166602

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