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APS » Journals » Phys. Rev. Lett. » Volume 93 » Issue 16
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Phys. Rev. Lett. 93, 166602 (2004) [4 pages]

Measurements of Kondo and Spin Splitting in Single-Electron Transistors

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A. Kogan1,*, S. Amasha1, D. Goldhaber-Gordon1,†, G. Granger1, M. A. Kastner1,‡, and Hadas Shtrikman2
1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2Braun Center for Submicron Research, Weizmann Institute of Science, Rehovot, 76100 Israel

Received 15 December 2003; published 14 October 2004

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=|g|μBB. 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|μBB in disagreement with theory.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.166602
DOI:
10.1103/PhysRevLett.93.166602
PACS:
72.15.Qm, 73.23.Hk, 75.20.Hr

*Current address: Department of Physics, University of Cincinnati, Cincinnati, OH 45221-0011, USA

†Current address: Geballe Laboratory for Advanced Materials, McCullough Building, Room 346, 476 Lomita Mall, Stanford, CA 94305-4045, USA

‡Electronic address: mkastner@mit.edu

 
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