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Kondo effect in an integer-spin quantum dot

Author

Listed:
  • S. Sasaki

    (NTT Basic Research Laboratories)

  • S. De Franceschi

    (DIMES and ERATO Mesoscopic Correlation Project, Delft University of Technology)

  • J. M. Elzerman

    (DIMES and ERATO Mesoscopic Correlation Project, Delft University of Technology)

  • W. G. van der Wiel

    (DIMES and ERATO Mesoscopic Correlation Project, Delft University of Technology)

  • M. Eto

    (DIMES and ERATO Mesoscopic Correlation Project, Delft University of Technology
    Faculty of Science and Technology, Keio University)

  • S. Tarucha

    (NTT Basic Research Laboratories
    ERATO Mesoscopic Correlation Project, University of Tokyo)

  • L. P. Kouwenhoven

    (DIMES and ERATO Mesoscopic Correlation Project, Delft University of Technology)

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 systems1,2. In fabricated structures, the control of single, localized spins is of technological relevance for nanoscale electronics3,4. Experiments have already demonstrated artificial realizations of isolated magnetic impurities at metallic surfaces5,6, nanoscale magnets7, controlled transitions between two-electron singlet and triplet states8, and a tunable Kondo effect in semiconductor quantum dots9,10,11,12. 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 ordinary spin-1/2 case.

Suggested Citation

  • S. Sasaki & S. De Franceschi & J. M. Elzerman & W. G. van der Wiel & M. Eto & S. Tarucha & L. P. Kouwenhoven, 2000. "Kondo effect in an integer-spin quantum dot," Nature, Nature, vol. 405(6788), pages 764-767, June.
    • Handle: RePEc:nat:nature:v:405:y:2000:i:6788:d:10.1038_35015509
    DOI: 10.1038/35015509
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    Cited by:

    1. Kosuke Noro & Yusuke Kozuka & Kazuma Matsumura & Takeshi Kumasaka & Yoshihiro Fujiwara & Atsushi Tsukazaki & Masashi Kawasaki & Tomohiro Otsuka, 2024. "Parity-independent Kondo effect of correlated electrons in electrostatically defined ZnO quantum dots," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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