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Phys. Rev. Lett. 88, 226805 (2002) [4 pages]

Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System

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S. M. Cronenwett1,2, H. J. Lynch1, D. Goldhaber-Gordon1,2, L. P. Kouwenhoven1,3, C. M. Marcus1, K. Hirose4, N. S. Wingreen5, and V. Umansky6
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138
2Department of Physics, Stanford University, Stanford, California 94305-4060
3Department of Applied Physics and ERATO, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands
4Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan
5NEC Research Institute, 4 Independence Way, Princeton, New Jersey 08540
6Braun Center for Submicron Research, Weizmann Institute of Science, Rehovot 76100, Israel

Received 31 January 2002; published 20 May 2002

Besides the usual conductance plateaus at multiples of 2e2/h, quantum point contacts typically show an extra plateau at ∼0.7(2e2/h), believed to arise from electron-electron interactions that prohibit the two spin channels from being simultaneously occupied. We present evidence that the disappearance of the 0.7 structure at very low temperature signals the formation of a Kondo-like correlated spin state. Evidence includes a zero-bias conductance peak that splits in a parallel field, scaling of conductance to a modified Kondo form, and consistency between peak width and the Kondo temperature.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.226805
DOI:
10.1103/PhysRevLett.88.226805
PACS:
73.23.Ad, 72.10.Fk, 72.15.Gd, 73.61.Ey
 
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