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Titolo:
Novel Kondo anomaly in quantum dots
Autore:
Tarucha, S; Austing, DG; Sasaki, S; Fujisawa, T; Tokura, Y; Elzerman, JM; van der Wiel, W; de Franseschi, S; Kouwenhoven, LP;
Indirizzi:
Univ Tokyo, Dept Phys, ERATO Mesoscop Correlat Project, Bunkyo Ku, Tokyo 1130033, Japan Univ Tokyo Tokyo Japan 1130033 Project, Bunkyo Ku, Tokyo 1130033, Japan Delft Univ Technol, Dept Appl Phys, ERATO Mesoscop Correlat Project, NL-2600 GA Delft, Netherlands Delft Univ Technol Delft Netherlands NL-2600 GA 00 GA Delft, Netherlands NTT, Basic Res Labs, Atsugi, Kanagawa 2430198, Japan NTT Atsugi Kanagawa Japan 2430198 s Labs, Atsugi, Kanagawa 2430198, Japan
Titolo Testata:
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
fascicolo: 1-2, volume: 84, anno: 2001,
pagine: 10 - 16
SICI:
0921-5107(20010705)84:1-2<10:NKAIQD>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-TRANSPORT; STATES;
Keywords:
quantum dot; Kondo effect; spin configuration; transport properties; interaction effect; singlet triplet transition;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Tarucha, S Univ Tokyo, Dept Phys, ERATO Mesoscop Correlat Project, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan Univ Tokyo 7-3-1 Hongo Tokyo Japan 1130033 okyo 1130033, Japan
Citazione:
S. Tarucha et al., "Novel Kondo anomaly in quantum dots", MAT SCI E B, 84(1-2), 2001, pp. 10-16

Abstract

Experimental observation of novel Kondo effects in quantum dots is reviewed with particular emphasis on the effect of magnetic field. The electronic configuration including spins in quantum dots can be modified by even a small magnetic field. We first use a vertical quantum dot with good tunabilityof orbital degeneracy in the few-electron regime but having a fixed tunnelcoupling between the dot and leads. By tuning the spin configuration out of two electrons as a function of magnetic field, we observe a strong Kondo effect when the spin singlet and triplet are degenerate. This is due to theincreased number of coherent co-tunneling processes. In the second we use a lateral quantum dot having good tunability of tile tunnel coupling but some ambiguity in the electronic configuration. By adjusting both of the tunnel coupling and magnetic field, we observe the Kondo effect in the unitary limit. This is only observed in the presence of a small magnetic field, andcan also be due to the change in the spin configuration. (C) 2001 ElsevierScience B.V. All rights reserved.

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Documento generato il 21/09/20 alle ore 12:56:35