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Science 27 October 2000:
Vol. 290. no. 5492, pp. 779 - 783
DOI: 10.1126/science.290.5492.779
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Reports

Phase Evolution in a Kondo-Correlated System

Yang Ji, M. Heiblum,* D. Sprinzak, D. Mahalu, Hadas Shtrikman

We measured the phase evolution of electrons as they traverse a quantum dot (QD) formed in a two-dimensional electron gas that serves as a localized spin. The traversal phase, determined by embedding the QD in a double path electron interferometer and measuring the quantum interference of the electron wave functions manifested by conductance oscillation as a function of a weak magnetic field, evolved by pi  radians, a range twice as large as theoretically predicted. As the correlation weakened, a gradual transition to the familiar phase evolution of a QD was observed. The specific phase evolution observed is highly sensitive to the onset of Kondo correlation, possibly serving as an alternative fingerprint of the Kondo effect.

Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
*   To whom correspondence should be addressed. E-mail: Heiblum{at}wisemail.weizmann.ac.il

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Controlling the Kondo Effect of an Adsorbed Magnetic Ion Through Its Chemical Bonding.
A. Zhao, Q. Li, L. Chen, H. Xiang, W. Wang, S. Pan, B. Wang, X. Xiao, J. Yang, J. G. Hou, et al. (2005)
Science 309, 1542-1544
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The Kondo Effect in an Artificial Quantum Dot Molecule.
H. Jeong, A. M. Chang, and M. R. Melloch (2001)
Science 293, 2221-2223
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