Kondo effect in an integer-spin quantum dot

S. Sasaki, S. De Franceschl, J. M. Elzerman, W. G. Van Der Wiel, Mikio Eto, S. Tarucha, L. P. Kouwenhoven

Research output: Contribution to journalArticle

425 Citations (Scopus)

Abstract

The Kondo effect - a many-body phenomenon in condensed-matter physics involving the interaction between a localized spin and free electrons - was discovered in metals containing small amounts of magnetic impurities, although it is now recognized to be of fundamental importance in a wide class of correlated electron systems. In fabricated structures, the control of single, localized spins is of technological relevance for nanoscale electronics. Experiments have already demonstrated artificial realizations of isolated magnetic impurities at metallic surfaces, nanoscale magnets, controlled transitions between two-electron singlet and triplet states, and a tunable Kondo effect in semiconductor quantum dots. Here we report an unexpected Kondo effect in a few-electron quantum dot containing singlet and triplet spin states, whose energy difference can be tuned with a magnetic field. We observe the effect for an even number of electrons, when the singlet and triplet states are degenerate. The characteristic energy scale is much larger than in the ordinal, spin-1/2 case.

Original languageEnglish
Pages (from-to)764-767
Number of pages4
JournalNature
Volume405
Issue number6788
DOIs
Publication statusPublished - 2000 Jun 15

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Kondo effect
integers
quantum dots
atomic energy levels
impurities
condensed matter physics
electrons
electron states
electron spin
free electrons
magnets
energy
electronics
magnetic fields
metals
interactions

ASJC Scopus subject areas

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Sasaki, S., De Franceschl, S., Elzerman, J. M., Van Der Wiel, W. G., Eto, M., Tarucha, S., & Kouwenhoven, L. P. (2000). Kondo effect in an integer-spin quantum dot. Nature, 405(6788), 764-767. https://doi.org/10.1038/35015509

Kondo effect in an integer-spin quantum dot. / Sasaki, S.; De Franceschl, S.; Elzerman, J. M.; Van Der Wiel, W. G.; Eto, Mikio; Tarucha, S.; Kouwenhoven, L. P.

In: Nature, Vol. 405, No. 6788, 15.06.2000, p. 764-767.

Research output: Contribution to journalArticle

Sasaki, S, De Franceschl, S, Elzerman, JM, Van Der Wiel, WG, Eto, M, Tarucha, S & Kouwenhoven, LP 2000, 'Kondo effect in an integer-spin quantum dot', Nature, vol. 405, no. 6788, pp. 764-767. https://doi.org/10.1038/35015509
Sasaki S, De Franceschl S, Elzerman JM, Van Der Wiel WG, Eto M, Tarucha S et al. Kondo effect in an integer-spin quantum dot. Nature. 2000 Jun 15;405(6788):764-767. https://doi.org/10.1038/35015509
Sasaki, S. ; De Franceschl, S. ; Elzerman, J. M. ; Van Der Wiel, W. G. ; Eto, Mikio ; Tarucha, S. ; Kouwenhoven, L. P. / Kondo effect in an integer-spin quantum dot. In: Nature. 2000 ; Vol. 405, No. 6788. pp. 764-767.
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