Kondo effect in an integer-spin quantum dot

S. Sasaki, S. De Franceschi (), J. M. Elzerman, W. G. van der Wiel, M. Eto, S. Tarucha and L. P. Kouwenhoven
Additional contact information
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
S. Tarucha: NTT Basic Research Laboratories
L. P. Kouwenhoven: DIMES and ERATO Mesoscopic Correlation Project, Delft University of Technology

Nature, 2000, vol. 405, issue 6788, 764-767

Abstract: 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.

Date: 2000
References: Add references at CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.nature.com/articles/35015509 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:405:y:2000:i:6788:d:10.1038_35015509

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/35015509

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().