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20 April 2024

» arxiv » cond-mat/0110432

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Two-stage Kondo effect in a quantum dot at high magnetic field
W.G. van der Wiel ; S. De Franceschi ; J.M. Elzerman ; S. Tarucha ; L.P. Kouwenhoven ; J. Motohisa ; F. Nakajima ; T. Fukui ;
Date:	20 Oct 2001
Journal:	Phys. Rev. Lett. 88, 126803 (2002).
Subject:	Mesoscopic Systems and Quantum Hall Effect \| cond-mat.mes-hall
Abstract:	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.
Source:	arXiv, cond-mat/0110432
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