Phys. Rev. B 72, 045308 (2005) [6 pages]

Kondo temperature dependence of the Kondo splitting in a single-electron transistor

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S. Amasha¹, I. J. Gelfand², M. A. Kastner^1,*, and A. Kogan^1,†
¹Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
²Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA

Received 22 November 2004; revised 8 March 2005; published 7 July 2005

A Kondo peak in the differential conductance of a single-electron transistor is measured as a function of both the magnetic field and the Kondo temperature. We observe that the Kondo splitting decreases logarithmically with the Kondo temperature and that there exists a critical magnetic field B_C below which the Kondo peak does not split, in qualitative agreement with theory. However, we find that the magnitude of the prefactor of the logarithm is larger than predicted and is independent of B, in contradiction with theory. Our measurements also suggest that the value of B_C is smaller than predicted.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.72.045308

DOI:

10.1103/PhysRevB.72.045308

PACS:

73.23.Hk, 72.15.Qm, 75.20.Hr

^*Electronic address: mkastner@mit.edu

^†Present address: Department of Physics, University of Cincinnati, Cincinnati, OH 45221-0011.

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Phys. Rev. B 72, 045308 (2005) [6 pages]

Kondo temperature dependence of the Kondo splitting in a single-electron transistor