The Kondo Effect in the Unitary Limit

Details The Kondo Effect in the Unitary Limit The Kondo Effect in the Unitary Limit

2000-09-26

arxiv.org/abs/cond-mat/0009405v1

W.G. van der Wiel et al., Science 289, 2105 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages

Scientific paper

10.1126/science.289.5487.2105

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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