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The Kondo Effect in the Unitary Limit

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arxiv cond-mat/0009405 v1 pith:MNVAUPOU submitted 2000-09-26 cond-mat.mes-hall cond-mat.str-el

W.G. van der Wiel , S. De Franceschi , T. Fujisawa , J.M. Elzerman , S. Tarucha , L.P. Kouwenhoven This is my paper
classification cond-mat.mes-hallcond-mat.str-el
keywords kondoeffectphasequantumwhenagreementaharonov-bohmanderson
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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-1/2 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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