Two-stage Kondo effect in a quantum dot at high magnetic field

F. Nakajima; J.M. Elzerman; J. Motohisa; L.P. Kouwenhoven; S. De Franceschi; S. Tarucha; T. Fukui; W.G. van der Wiel

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Two-stage Kondo effect in a quantum dot at high magnetic field

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arxiv cond-mat/0110432 v1 pith:RMNMLBTC submitted 2001-10-20 cond-mat.mes-hall

W.G. van der Wiel , S. De Franceschi , J.M. Elzerman , S. Tarucha , L.P. Kouwenhoven , J. Motohisa , F. Nakajima , T. Fukui This is my paper

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We report a strong Kondo effect (Kondo temperature ~ 4K) at high magnetic field in a selective area growth semiconductor quantum dot. The Kondo effect is ascribed to a singlet-triplet transition in the ground state of the dot. At the transition, the low-temperature conductance approaches the unitary limit. Away from the transition, for low bias voltages and temperatures, the conductance is sharply reduced. The observed behavior is compared to predictions for a two-stage Kondo effect in quantum dots coupled to single-channel leads.

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