The Kondo Effect in the Unitary Limit
Science2000Vol. 289(5487), pp. 2105–2108
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Wilfred G. van der Wiel, S. De Franceschi, T. Fujisawa, J. M. Elzerman, Seigo Tarucha, Leo P. Kouwenhoven
Abstract
We observe a strong Kondo effect in a semiconductor quantum dot when a small magnetic field is applied. The Coulomb blockade for electron tunneling is overcome completely by the Kondo effect, and the conductance reaches the unitary limit value. We compare the experimental Kondo temperature with the theoretical predictions for the spin- 12 Anderson impurity model. Excellent agreement is found throughout the Kondo regime. Phase coherence is preserved when a Kondo quantum dot is included in one of the arms of an Aharonov-Bohm ring structure, and the phase behavior differs from previous results on a non-Kondo dot.
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