Measurements of Kondo and spin splitting in single-electron transistors |
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Authors: | Kogan A Amasha S Goldhaber-Gordon D Granger G Kastner M A Shtrikman Hadas |
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Institution: | Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. |
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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 Delta=/g/mu(B)B. 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/g/mu(B)B in disagreement with theory. |
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